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Finding the Fourth Proportional to 261,797.60, 392,890.80 and 104,139.20

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Solution

The fourth proportional to 261,797.60, 392,890.80 and 104,139.20 is: 156,286.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,797.60 : 392,890.80 = 104,139.20 : x
  2. Step 2: Convert to fraction form
    261,797.60/392,890.80 = 104,139.20/x
  3. Step 3: Cross multiply
    261,797.60x = 392,890.80 × 104,139.20
  4. Step 4: Simplify right side
    261,797.60x = 40,915,333,599.36
  5. Step 5: Solve for x
    x = 40,915,333,599.36/261,797.60
  6. Step 6: Final answer
    x = 156,286.13

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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.