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Finding the Fourth Proportional to 642.96, 885.15 and 577.32

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Solution

The fourth proportional to 642.96, 885.15 and 577.32 is: 794.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.96 : 885.15 = 577.32 : x
  2. Step 2: Convert to fraction form
    642.96/885.15 = 577.32/x
  3. Step 3: Cross multiply
    642.96x = 885.15 × 577.32
  4. Step 4: Simplify right side
    642.96x = 511,014.80
  5. Step 5: Solve for x
    x = 511,014.80/642.96
  6. Step 6: Final answer
    x = 794.78

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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.