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Finding the Fourth Proportional to 642.76, 887.33 and 502.54

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Solution

The fourth proportional to 642.76, 887.33 and 502.54 is: 693.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.76 : 887.33 = 502.54 : x
  2. Step 2: Convert to fraction form
    642.76/887.33 = 502.54/x
  3. Step 3: Cross multiply
    642.76x = 887.33 × 502.54
  4. Step 4: Simplify right side
    642.76x = 445,917.86
  5. Step 5: Solve for x
    x = 445,917.86/642.76
  6. Step 6: Final answer
    x = 693.76

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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.