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Finding the Fourth Proportional to 80,856.72, 121,285.08 and 21,691.08

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Solution

The fourth proportional to 80,856.72, 121,285.08 and 21,691.08 is: 32,536.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,856.72 : 121,285.08 = 21,691.08 : x
  2. Step 2: Convert to fraction form
    80,856.72/121,285.08 = 21,691.08/x
  3. Step 3: Cross multiply
    80,856.72x = 121,285.08 × 21,691.08
  4. Step 4: Simplify right side
    80,856.72x = 2,630,804,373.09
  5. Step 5: Solve for x
    x = 2,630,804,373.09/80,856.72
  6. Step 6: Final answer
    x = 32,536.62

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1.5x scale

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.