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Finding the Fourth Proportional to 603.76, 905 and 432.24

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Solution

The fourth proportional to 603.76, 905 and 432.24 is: 647.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.76 : 905 = 432.24 : x
  2. Step 2: Convert to fraction form
    603.76/905 = 432.24/x
  3. Step 3: Cross multiply
    603.76x = 905 × 432.24
  4. Step 4: Simplify right side
    603.76x = 391,177.20
  5. Step 5: Solve for x
    x = 391,177.20/603.76
  6. Step 6: Final answer
    x = 647.90

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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.