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Finding the Fourth Proportional to 381,316.28, 571,978.50 and 115,079.18

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Solution

The fourth proportional to 381,316.28, 571,978.50 and 115,079.18 is: 172,620.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,316.28 : 571,978.50 = 115,079.18 : x
  2. Step 2: Convert to fraction form
    381,316.28/571,978.50 = 115,079.18/x
  3. Step 3: Cross multiply
    381,316.28x = 571,978.50 × 115,079.18
  4. Step 4: Simplify right side
    381,316.28x = 65,822,816,757.63
  5. Step 5: Solve for x
    x = 65,822,816,757.63/381,316.28
  6. Step 6: Final answer
    x = 172,620.00

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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.