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Finding the Fourth Proportional to 345,021.20, 517,531.80 and 108,387.80

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Solution

The fourth proportional to 345,021.20, 517,531.80 and 108,387.80 is: 162,581.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,021.20 : 517,531.80 = 108,387.80 : x
  2. Step 2: Convert to fraction form
    345,021.20/517,531.80 = 108,387.80/x
  3. Step 3: Cross multiply
    345,021.20x = 517,531.80 × 108,387.80
  4. Step 4: Simplify right side
    345,021.20x = 56,094,133,232.04
  5. Step 5: Solve for x
    x = 56,094,133,232.04/345,021.20
  6. Step 6: Final answer
    x = 162,581.70

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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.