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Finding the Fourth Proportional to 3,118.95, 4,678.40 and 927.50

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Solution

The fourth proportional to 3,118.95, 4,678.40 and 927.50 is: 1,391.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,118.95 : 4,678.40 = 927.50 : x
  2. Step 2: Convert to fraction form
    3,118.95/4,678.40 = 927.50/x
  3. Step 3: Cross multiply
    3,118.95x = 4,678.40 × 927.50
  4. Step 4: Simplify right side
    3,118.95x = 4,339,187.97
  5. Step 5: Solve for x
    x = 4,339,187.97/3,118.95
  6. Step 6: Final answer
    x = 1,391.23

Related Problems

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Half scale
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Double scale
Find fourth proportional to 3,119.95, 4,679.89 and 928.50
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.