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Finding the Fourth Proportional to 861.62, 1,189.28 and 512.51

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Solution

The fourth proportional to 861.62, 1,189.28 and 512.51 is: 707.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.62 : 1,189.28 = 512.51 : x
  2. Step 2: Convert to fraction form
    861.62/1,189.28 = 512.51/x
  3. Step 3: Cross multiply
    861.62x = 1,189.28 × 512.51
  4. Step 4: Simplify right side
    861.62x = 609,517.89
  5. Step 5: Solve for x
    x = 609,517.89/861.62
  6. Step 6: Final answer
    x = 707.41

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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.