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Finding the Fourth Proportional to 642.55, 887.31 and 572.62

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Solution

The fourth proportional to 642.55, 887.31 and 572.62 is: 790.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.55 : 887.31 = 572.62 : x
  2. Step 2: Convert to fraction form
    642.55/887.31 = 572.62/x
  3. Step 3: Cross multiply
    642.55x = 887.31 × 572.62
  4. Step 4: Simplify right side
    642.55x = 508,091.45
  5. Step 5: Solve for x
    x = 508,091.45/642.55
  6. Step 6: Final answer
    x = 790.74

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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.