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Finding the Fourth Proportional to 485,428.26, 728,141.76 and 130,442.28

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Solution

The fourth proportional to 485,428.26, 728,141.76 and 130,442.28 is: 195,663.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,428.26 : 728,141.76 = 130,442.28 : x
  2. Step 2: Convert to fraction form
    485,428.26/728,141.76 = 130,442.28/x
  3. Step 3: Cross multiply
    485,428.26x = 728,141.76 × 130,442.28
  4. Step 4: Simplify right side
    485,428.26x = 94,980,471,337.61
  5. Step 5: Solve for x
    x = 94,980,471,337.61/485,428.26
  6. Step 6: Final answer
    x = 195,663.25

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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.