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Finding the Fourth Proportional to 765.12, 1,055.10 and 624.80

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Solution

The fourth proportional to 765.12, 1,055.10 and 624.80 is: 861.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.12 : 1,055.10 = 624.80 : x
  2. Step 2: Convert to fraction form
    765.12/1,055.10 = 624.80/x
  3. Step 3: Cross multiply
    765.12x = 1,055.10 × 624.80
  4. Step 4: Simplify right side
    765.12x = 659,221.20
  5. Step 5: Solve for x
    x = 659,221.20/765.12
  6. Step 6: Final answer
    x = 861.59

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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.