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Finding the Fourth Proportional to 779.92, 1,077.32 and 614.64

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Solution

The fourth proportional to 779.92, 1,077.32 and 614.64 is: 849.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.92 : 1,077.32 = 614.64 : x
  2. Step 2: Convert to fraction form
    779.92/1,077.32 = 614.64/x
  3. Step 3: Cross multiply
    779.92x = 1,077.32 × 614.64
  4. Step 4: Simplify right side
    779.92x = 662,163.96
  5. Step 5: Solve for x
    x = 662,163.96/779.92
  6. Step 6: Final answer
    x = 849.02

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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.