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Finding the Fourth Proportional to 618.70, 928.26 and 253.60

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Solution

The fourth proportional to 618.70, 928.26 and 253.60 is: 380.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.70 : 928.26 = 253.60 : x
  2. Step 2: Convert to fraction form
    618.70/928.26 = 253.60/x
  3. Step 3: Cross multiply
    618.70x = 928.26 × 253.60
  4. Step 4: Simplify right side
    618.70x = 235,406.74
  5. Step 5: Solve for x
    x = 235,406.74/618.70
  6. Step 6: Final answer
    x = 380.49

Related Problems

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Half scale
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Double scale
Find fourth proportional to 619.70, 929.76 and 254.60
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.