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Finding the Fourth Proportional to 485,609.40, 728,489.08 and 165,686.28

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Solution

The fourth proportional to 485,609.40, 728,489.08 and 165,686.28 is: 248,555.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,609.40 : 728,489.08 = 165,686.28 : x
  2. Step 2: Convert to fraction form
    485,609.40/728,489.08 = 165,686.28/x
  3. Step 3: Cross multiply
    485,609.40x = 728,489.08 × 165,686.28
  4. Step 4: Simplify right side
    485,609.40x = 120,700,645,685.82
  5. Step 5: Solve for x
    x = 120,700,645,685.82/485,609.40
  6. Step 6: Final answer
    x = 248,555.00

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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.