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Finding the Fourth Proportional to 642.87, 887.67 and 502.86

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Solution

The fourth proportional to 642.87, 887.67 and 502.86 is: 694.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.87 : 887.67 = 502.86 : x
  2. Step 2: Convert to fraction form
    642.87/887.67 = 502.86/x
  3. Step 3: Cross multiply
    642.87x = 887.67 × 502.86
  4. Step 4: Simplify right side
    642.87x = 446,373.74
  5. Step 5: Solve for x
    x = 446,373.74/642.87
  6. Step 6: Final answer
    x = 694.35

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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.