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Finding the Fourth Proportional to 485,387.12, 728,031.47 and 130,355.01

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Solution

The fourth proportional to 485,387.12, 728,031.47 and 130,355.01 is: 195,519.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,387.12 : 728,031.47 = 130,355.01 : x
  2. Step 2: Convert to fraction form
    485,387.12/728,031.47 = 130,355.01/x
  3. Step 3: Cross multiply
    485,387.12x = 728,031.47 × 130,355.01
  4. Step 4: Simplify right side
    485,387.12x = 94,902,548,900.39
  5. Step 5: Solve for x
    x = 94,902,548,900.39/485,387.12
  6. Step 6: Final answer
    x = 195,519.30

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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.