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Finding the Fourth Proportional to 773.20, 1,157.10 and 708.40

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Solution

The fourth proportional to 773.20, 1,157.10 and 708.40 is: 1,060.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.20 : 1,157.10 = 708.40 : x
  2. Step 2: Convert to fraction form
    773.20/1,157.10 = 708.40/x
  3. Step 3: Cross multiply
    773.20x = 1,157.10 × 708.40
  4. Step 4: Simplify right side
    773.20x = 819,689.64
  5. Step 5: Solve for x
    x = 819,689.64/773.20
  6. Step 6: Final answer
    x = 1,060.13

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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.