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Finding the Fourth Proportional to 908.16, 1,360.80 and 691.20

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Solution

The fourth proportional to 908.16, 1,360.80 and 691.20 is: 1,035.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.16 : 1,360.80 = 691.20 : x
  2. Step 2: Convert to fraction form
    908.16/1,360.80 = 691.20/x
  3. Step 3: Cross multiply
    908.16x = 1,360.80 × 691.20
  4. Step 4: Simplify right side
    908.16x = 940,584.96
  5. Step 5: Solve for x
    x = 940,584.96/908.16
  6. Step 6: Final answer
    x = 1,035.70

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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.