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Finding the Fourth Proportional to 85,321.60, 128,087.70 and 53,731.60

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Solution

The fourth proportional to 85,321.60, 128,087.70 and 53,731.60 is: 80,663.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,321.60 : 128,087.70 = 53,731.60 : x
  2. Step 2: Convert to fraction form
    85,321.60/128,087.70 = 53,731.60/x
  3. Step 3: Cross multiply
    85,321.60x = 128,087.70 × 53,731.60
  4. Step 4: Simplify right side
    85,321.60x = 6,882,357,061.32
  5. Step 5: Solve for x
    x = 6,882,357,061.32/85,321.60
  6. Step 6: Final answer
    x = 80,663.71

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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.