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Finding the Fourth Proportional to 1,006.30, 1,385.34 and 865.85

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Solution

The fourth proportional to 1,006.30, 1,385.34 and 865.85 is: 1,191.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.30 : 1,385.34 = 865.85 : x
  2. Step 2: Convert to fraction form
    1,006.30/1,385.34 = 865.85/x
  3. Step 3: Cross multiply
    1,006.30x = 1,385.34 × 865.85
  4. Step 4: Simplify right side
    1,006.30x = 1,199,491.66
  5. Step 5: Solve for x
    x = 1,199,491.66/1,006.30
  6. Step 6: Final answer
    x = 1,191.98

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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.