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Finding the Fourth Proportional to 268,685.60, 402,889.28 and 79,121.30

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Solution

The fourth proportional to 268,685.60, 402,889.28 and 79,121.30 is: 118,640.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,685.60 : 402,889.28 = 79,121.30 : x
  2. Step 2: Convert to fraction form
    268,685.60/402,889.28 = 79,121.30/x
  3. Step 3: Cross multiply
    268,685.60x = 402,889.28 × 79,121.30
  4. Step 4: Simplify right side
    268,685.60x = 31,877,121,179.61
  5. Step 5: Solve for x
    x = 31,877,121,179.61/268,685.60
  6. Step 6: Final answer
    x = 118,640.98

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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.