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Finding the Fourth Proportional to 485,695.66, 728,477.87 and 130,730.98

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Solution

The fourth proportional to 485,695.66, 728,477.87 and 130,730.98 is: 196,078.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,695.66 : 728,477.87 = 130,730.98 : x
  2. Step 2: Convert to fraction form
    485,695.66/728,477.87 = 130,730.98/x
  3. Step 3: Cross multiply
    485,695.66x = 728,477.87 × 130,730.98
  4. Step 4: Simplify right side
    485,695.66x = 95,234,625,479.82
  5. Step 5: Solve for x
    x = 95,234,625,479.82/485,695.66
  6. Step 6: Final answer
    x = 196,078.81

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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.