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Finding the Fourth Proportional to 658.24, 907.77 and 421.91

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Solution

The fourth proportional to 658.24, 907.77 and 421.91 is: 581.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.24 : 907.77 = 421.91 : x
  2. Step 2: Convert to fraction form
    658.24/907.77 = 421.91/x
  3. Step 3: Cross multiply
    658.24x = 907.77 × 421.91
  4. Step 4: Simplify right side
    658.24x = 382,997.24
  5. Step 5: Solve for x
    x = 382,997.24/658.24
  6. Step 6: Final answer
    x = 581.85

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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.