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Finding the Fourth Proportional to 485,428.49, 728,142.11 and 130,442.52

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Solution

The fourth proportional to 485,428.49, 728,142.11 and 130,442.52 is: 195,663.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,428.49 : 728,142.11 = 130,442.52 : x
  2. Step 2: Convert to fraction form
    485,428.49/728,142.11 = 130,442.52/x
  3. Step 3: Cross multiply
    485,428.49x = 728,142.11 × 130,442.52
  4. Step 4: Simplify right side
    485,428.49x = 94,980,692,072.62
  5. Step 5: Solve for x
    x = 94,980,692,072.62/485,428.49
  6. Step 6: Final answer
    x = 195,663.61

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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.