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Finding the Fourth Proportional to 85,359.60, 128,065.32 and 38,612.88

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Solution

The fourth proportional to 85,359.60, 128,065.32 and 38,612.88 is: 57,931.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,359.60 : 128,065.32 = 38,612.88 : x
  2. Step 2: Convert to fraction form
    85,359.60/128,065.32 = 38,612.88/x
  3. Step 3: Cross multiply
    85,359.60x = 128,065.32 × 38,612.88
  4. Step 4: Simplify right side
    85,359.60x = 4,944,970,833.32
  5. Step 5: Solve for x
    x = 4,944,970,833.32/85,359.60
  6. Step 6: Final answer
    x = 57,931.05

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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.