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Finding the Fourth Proportional to 85,856.60, 128,784.90 and 72,896.60

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Solution

The fourth proportional to 85,856.60, 128,784.90 and 72,896.60 is: 109,344.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,856.60 : 128,784.90 = 72,896.60 : x
  2. Step 2: Convert to fraction form
    85,856.60/128,784.90 = 72,896.60/x
  3. Step 3: Cross multiply
    85,856.60x = 128,784.90 × 72,896.60
  4. Step 4: Simplify right side
    85,856.60x = 9,387,981,341.34
  5. Step 5: Solve for x
    x = 9,387,981,341.34/85,856.60
  6. Step 6: Final answer
    x = 109,344.90

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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.