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Finding the Fourth Proportional to 500.75, 691.09 and 279.71

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Solution

The fourth proportional to 500.75, 691.09 and 279.71 is: 386.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.75 : 691.09 = 279.71 : x
  2. Step 2: Convert to fraction form
    500.75/691.09 = 279.71/x
  3. Step 3: Cross multiply
    500.75x = 691.09 × 279.71
  4. Step 4: Simplify right side
    500.75x = 193,305.81
  5. Step 5: Solve for x
    x = 193,305.81/500.75
  6. Step 6: Final answer
    x = 386.03

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Find fourth proportional to 250.38, 345.54 and 139.86
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.