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Finding the Fourth Proportional to 424.68, 637.06 and 390.86

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Solution

The fourth proportional to 424.68, 637.06 and 390.86 is: 586.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.68 : 637.06 = 390.86 : x
  2. Step 2: Convert to fraction form
    424.68/637.06 = 390.86/x
  3. Step 3: Cross multiply
    424.68x = 637.06 × 390.86
  4. Step 4: Simplify right side
    424.68x = 249,001.27
  5. Step 5: Solve for x
    x = 249,001.27/424.68
  6. Step 6: Final answer
    x = 586.33

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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.