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Finding the Fourth Proportional to 642.43, 887.42 and 477.50

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Solution

The fourth proportional to 642.43, 887.42 and 477.50 is: 659.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.43 : 887.42 = 477.50 : x
  2. Step 2: Convert to fraction form
    642.43/887.42 = 477.50/x
  3. Step 3: Cross multiply
    642.43x = 887.42 × 477.50
  4. Step 4: Simplify right side
    642.43x = 423,746.46
  5. Step 5: Solve for x
    x = 423,746.46/642.43
  6. Step 6: Final answer
    x = 659.60

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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.