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Finding the Fourth Proportional to 836.87, 1,155.17 and 487.85

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Solution

The fourth proportional to 836.87, 1,155.17 and 487.85 is: 673.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.87 : 1,155.17 = 487.85 : x
  2. Step 2: Convert to fraction form
    836.87/1,155.17 = 487.85/x
  3. Step 3: Cross multiply
    836.87x = 1,155.17 × 487.85
  4. Step 4: Simplify right side
    836.87x = 563,549.68
  5. Step 5: Solve for x
    x = 563,549.68/836.87
  6. Step 6: Final answer
    x = 673.40

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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.