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Finding the Fourth Proportional to 642.57, 887.66 and 497.08

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Solution

The fourth proportional to 642.57, 887.66 and 497.08 is: 686.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.57 : 887.66 = 497.08 : x
  2. Step 2: Convert to fraction form
    642.57/887.66 = 497.08/x
  3. Step 3: Cross multiply
    642.57x = 887.66 × 497.08
  4. Step 4: Simplify right side
    642.57x = 441,238.03
  5. Step 5: Solve for x
    x = 441,238.03/642.57
  6. Step 6: Final answer
    x = 686.68

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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.