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Finding the Fourth Proportional to 138,799.60, 208,199.40 and 89,033.20

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Solution

The fourth proportional to 138,799.60, 208,199.40 and 89,033.20 is: 133,549.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,799.60 : 208,199.40 = 89,033.20 : x
  2. Step 2: Convert to fraction form
    138,799.60/208,199.40 = 89,033.20/x
  3. Step 3: Cross multiply
    138,799.60x = 208,199.40 × 89,033.20
  4. Step 4: Simplify right side
    138,799.60x = 18,536,658,820.08
  5. Step 5: Solve for x
    x = 18,536,658,820.08/138,799.60
  6. Step 6: Final answer
    x = 133,549.80

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1.5x scale

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.