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Finding the Fourth Proportional to 485,198.39, 727,697.34 and 130,128

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Solution

The fourth proportional to 485,198.39, 727,697.34 and 130,128 is: 195,165.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,198.39 : 727,697.34 = 130,128 : x
  2. Step 2: Convert to fraction form
    485,198.39/727,697.34 = 130,128/x
  3. Step 3: Cross multiply
    485,198.39x = 727,697.34 × 130,128
  4. Step 4: Simplify right side
    485,198.39x = 94,693,799,459.52
  5. Step 5: Solve for x
    x = 94,693,799,459.52/485,198.39
  6. Step 6: Final answer
    x = 195,165.12

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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.