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Finding the Fourth Proportional to 691.10, 1,036.86 and 280.46

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Solution

The fourth proportional to 691.10, 1,036.86 and 280.46 is: 420.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.10 : 1,036.86 = 280.46 : x
  2. Step 2: Convert to fraction form
    691.10/1,036.86 = 280.46/x
  3. Step 3: Cross multiply
    691.10x = 1,036.86 × 280.46
  4. Step 4: Simplify right side
    691.10x = 290,792.57
  5. Step 5: Solve for x
    x = 290,792.57/691.10
  6. Step 6: Final answer
    x = 420.77

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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.