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Finding the Fourth Proportional to 642.08, 887.88 and 613.04

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Solution

The fourth proportional to 642.08, 887.88 and 613.04 is: 847.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.08 : 887.88 = 613.04 : x
  2. Step 2: Convert to fraction form
    642.08/887.88 = 613.04/x
  3. Step 3: Cross multiply
    642.08x = 887.88 × 613.04
  4. Step 4: Simplify right side
    642.08x = 544,305.96
  5. Step 5: Solve for x
    x = 544,305.96/642.08
  6. Step 6: Final answer
    x = 847.72

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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.