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Finding the Fourth Proportional to 85,715.20, 128,718.60 and 63,553.60

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Solution

The fourth proportional to 85,715.20, 128,718.60 and 63,553.60 is: 95,438.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,715.20 : 128,718.60 = 63,553.60 : x
  2. Step 2: Convert to fraction form
    85,715.20/128,718.60 = 63,553.60/x
  3. Step 3: Cross multiply
    85,715.20x = 128,718.60 × 63,553.60
  4. Step 4: Simplify right side
    85,715.20x = 8,180,530,416.96
  5. Step 5: Solve for x
    x = 8,180,530,416.96/85,715.20
  6. Step 6: Final answer
    x = 95,438.50

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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.