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Finding the Fourth Proportional to 641.55, 885.63 and 431.87

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Solution

The fourth proportional to 641.55, 885.63 and 431.87 is: 596.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.55 : 885.63 = 431.87 : x
  2. Step 2: Convert to fraction form
    641.55/885.63 = 431.87/x
  3. Step 3: Cross multiply
    641.55x = 885.63 × 431.87
  4. Step 4: Simplify right side
    641.55x = 382,472.60
  5. Step 5: Solve for x
    x = 382,472.60/641.55
  6. Step 6: Final answer
    x = 596.17

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1.5x scale

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.