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Finding the Fourth Proportional to 138,691.60, 208,037.40 and 122,621.20

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Solution

The fourth proportional to 138,691.60, 208,037.40 and 122,621.20 is: 183,931.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,691.60 : 208,037.40 = 122,621.20 : x
  2. Step 2: Convert to fraction form
    138,691.60/208,037.40 = 122,621.20/x
  3. Step 3: Cross multiply
    138,691.60x = 208,037.40 × 122,621.20
  4. Step 4: Simplify right side
    138,691.60x = 25,509,795,632.88
  5. Step 5: Solve for x
    x = 25,509,795,632.88/138,691.60
  6. Step 6: Final answer
    x = 183,931.80

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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.