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Finding the Fourth Proportional to 861.03, 1,285.67 and 715.23

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Solution

The fourth proportional to 861.03, 1,285.67 and 715.23 is: 1,067.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.03 : 1,285.67 = 715.23 : x
  2. Step 2: Convert to fraction form
    861.03/1,285.67 = 715.23/x
  3. Step 3: Cross multiply
    861.03x = 1,285.67 × 715.23
  4. Step 4: Simplify right side
    861.03x = 919,551.54
  5. Step 5: Solve for x
    x = 919,551.54/861.03
  6. Step 6: Final answer
    x = 1,067.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.