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Finding the Fourth Proportional to 487.55, 672.10 and 404.93

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Solution

The fourth proportional to 487.55, 672.10 and 404.93 is: 558.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.55 : 672.10 = 404.93 : x
  2. Step 2: Convert to fraction form
    487.55/672.10 = 404.93/x
  3. Step 3: Cross multiply
    487.55x = 672.10 × 404.93
  4. Step 4: Simplify right side
    487.55x = 272,154.12
  5. Step 5: Solve for x
    x = 272,154.12/487.55
  6. Step 6: Final answer
    x = 558.20

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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.