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Finding the Fourth Proportional to 3,178.86, 4,768.29 and 987

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Solution

The fourth proportional to 3,178.86, 4,768.29 and 987 is: 1,480.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.86 : 4,768.29 = 987 : x
  2. Step 2: Convert to fraction form
    3,178.86/4,768.29 = 987/x
  3. Step 3: Cross multiply
    3,178.86x = 4,768.29 × 987
  4. Step 4: Simplify right side
    3,178.86x = 4,706,302.23
  5. Step 5: Solve for x
    x = 4,706,302.23/3,178.86
  6. Step 6: Final answer
    x = 1,480.50

Related Problems

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Half scale
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Double scale
Find fourth proportional to 3,179.86, 4,769.79 and 988
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.