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Finding the Fourth Proportional to 1,285.92, 1,774.96 and 872.16

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Solution

The fourth proportional to 1,285.92, 1,774.96 and 872.16 is: 1,203.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.92 : 1,774.96 = 872.16 : x
  2. Step 2: Convert to fraction form
    1,285.92/1,774.96 = 872.16/x
  3. Step 3: Cross multiply
    1,285.92x = 1,774.96 × 872.16
  4. Step 4: Simplify right side
    1,285.92x = 1,548,049.11
  5. Step 5: Solve for x
    x = 1,548,049.11/1,285.92
  6. Step 6: Final answer
    x = 1,203.85

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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.