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Finding the Fourth Proportional to 316,624.32, 474,961.16 and 91,988.40

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Solution

The fourth proportional to 316,624.32, 474,961.16 and 91,988.40 is: 137,989.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,624.32 : 474,961.16 = 91,988.40 : x
  2. Step 2: Convert to fraction form
    316,624.32/474,961.16 = 91,988.40/x
  3. Step 3: Cross multiply
    316,624.32x = 474,961.16 × 91,988.40
  4. Step 4: Simplify right side
    316,624.32x = 43,690,917,170.54
  5. Step 5: Solve for x
    x = 43,690,917,170.54/316,624.32
  6. Step 6: Final answer
    x = 137,989.77

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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.