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Finding the Fourth Proportional to 1,079.72, 1,490.02 and 613.96

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Solution

The fourth proportional to 1,079.72, 1,490.02 and 613.96 is: 847.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.72 : 1,490.02 = 613.96 : x
  2. Step 2: Convert to fraction form
    1,079.72/1,490.02 = 613.96/x
  3. Step 3: Cross multiply
    1,079.72x = 1,490.02 × 613.96
  4. Step 4: Simplify right side
    1,079.72x = 914,812.68
  5. Step 5: Solve for x
    x = 914,812.68/1,079.72
  6. Step 6: Final answer
    x = 847.27

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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.