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Finding the Fourth Proportional to 485,686.58, 728,464.26 and 130,721.90

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Solution

The fourth proportional to 485,686.58, 728,464.26 and 130,721.90 is: 196,065.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,686.58 : 728,464.26 = 130,721.90 : x
  2. Step 2: Convert to fraction form
    485,686.58/728,464.26 = 130,721.90/x
  3. Step 3: Cross multiply
    485,686.58x = 728,464.26 × 130,721.90
  4. Step 4: Simplify right side
    485,686.58x = 95,226,232,149.29
  5. Step 5: Solve for x
    x = 95,226,232,149.29/485,686.58
  6. Step 6: Final answer
    x = 196,065.19

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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.