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Finding the Fourth Proportional to 777.92, 1,160 and 724.96

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Solution

The fourth proportional to 777.92, 1,160 and 724.96 is: 1,081.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.92 : 1,160 = 724.96 : x
  2. Step 2: Convert to fraction form
    777.92/1,160 = 724.96/x
  3. Step 3: Cross multiply
    777.92x = 1,160 × 724.96
  4. Step 4: Simplify right side
    777.92x = 840,953.60
  5. Step 5: Solve for x
    x = 840,953.60/777.92
  6. Step 6: Final answer
    x = 1,081.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.