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Finding the Fourth Proportional to 938.14, 1,406.82 and 424.78

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Solution

The fourth proportional to 938.14, 1,406.82 and 424.78 is: 636.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.14 : 1,406.82 = 424.78 : x
  2. Step 2: Convert to fraction form
    938.14/1,406.82 = 424.78/x
  3. Step 3: Cross multiply
    938.14x = 1,406.82 × 424.78
  4. Step 4: Simplify right side
    938.14x = 597,589.00
  5. Step 5: Solve for x
    x = 597,589.00/938.14
  6. Step 6: Final answer
    x = 636.99

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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.