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Finding the Fourth Proportional to 389,633.28, 584,483.20 and 136,891.68

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Solution

The fourth proportional to 389,633.28, 584,483.20 and 136,891.68 is: 205,349.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,633.28 : 584,483.20 = 136,891.68 : x
  2. Step 2: Convert to fraction form
    389,633.28/584,483.20 = 136,891.68/x
  3. Step 3: Cross multiply
    389,633.28x = 584,483.20 × 136,891.68
  4. Step 4: Simplify right side
    389,633.28x = 80,010,887,179.78
  5. Step 5: Solve for x
    x = 80,010,887,179.78/389,633.28
  6. Step 6: Final answer
    x = 205,349.21

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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.