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Finding the Fourth Proportional to 1,079.92, 1,618.66 and 429.90

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Solution

The fourth proportional to 1,079.92, 1,618.66 and 429.90 is: 644.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.92 : 1,618.66 = 429.90 : x
  2. Step 2: Convert to fraction form
    1,079.92/1,618.66 = 429.90/x
  3. Step 3: Cross multiply
    1,079.92x = 1,618.66 × 429.90
  4. Step 4: Simplify right side
    1,079.92x = 695,861.93
  5. Step 5: Solve for x
    x = 695,861.93/1,079.92
  6. Step 6: Final answer
    x = 644.36

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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.