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Finding the Fourth Proportional to 1,562.13, 2,155.79 and 863.55

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Solution

The fourth proportional to 1,562.13, 2,155.79 and 863.55 is: 1,191.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,562.13 : 2,155.79 = 863.55 : x
  2. Step 2: Convert to fraction form
    1,562.13/2,155.79 = 863.55/x
  3. Step 3: Cross multiply
    1,562.13x = 2,155.79 × 863.55
  4. Step 4: Simplify right side
    1,562.13x = 1,861,617.36
  5. Step 5: Solve for x
    x = 1,861,617.36/1,562.13
  6. Step 6: Final answer
    x = 1,191.72

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1.5x scale

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.