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Finding the Fourth Proportional to 1,135.92, 1,702.42 and 486

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Solution

The fourth proportional to 1,135.92, 1,702.42 and 486 is: 728.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.92 : 1,702.42 = 486 : x
  2. Step 2: Convert to fraction form
    1,135.92/1,702.42 = 486/x
  3. Step 3: Cross multiply
    1,135.92x = 1,702.42 × 486
  4. Step 4: Simplify right side
    1,135.92x = 827,376.12
  5. Step 5: Solve for x
    x = 827,376.12/1,135.92
  6. Step 6: Final answer
    x = 728.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.