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Finding the Fourth Proportional to 707.92, 1,062.08 and 611.12

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Solution

The fourth proportional to 707.92, 1,062.08 and 611.12 is: 916.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.92 : 1,062.08 = 611.12 : x
  2. Step 2: Convert to fraction form
    707.92/1,062.08 = 611.12/x
  3. Step 3: Cross multiply
    707.92x = 1,062.08 × 611.12
  4. Step 4: Simplify right side
    707.92x = 649,058.33
  5. Step 5: Solve for x
    x = 649,058.33/707.92
  6. Step 6: Final answer
    x = 916.85

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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.