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Finding the Fourth Proportional to 485,685.58, 728,462.76 and 130,720.90

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Solution

The fourth proportional to 485,685.58, 728,462.76 and 130,720.90 is: 196,063.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,685.58 : 728,462.76 = 130,720.90 : x
  2. Step 2: Convert to fraction form
    485,685.58/728,462.76 = 130,720.90/x
  3. Step 3: Cross multiply
    485,685.58x = 728,462.76 × 130,720.90
  4. Step 4: Simplify right side
    485,685.58x = 95,225,307,603.68
  5. Step 5: Solve for x
    x = 95,225,307,603.68/485,685.58
  6. Step 6: Final answer
    x = 196,063.69

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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.