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Finding the Fourth Proportional to 138,368.80, 207,553.20 and 91,129.60

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Solution

The fourth proportional to 138,368.80, 207,553.20 and 91,129.60 is: 136,694.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,368.80 : 207,553.20 = 91,129.60 : x
  2. Step 2: Convert to fraction form
    138,368.80/207,553.20 = 91,129.60/x
  3. Step 3: Cross multiply
    138,368.80x = 207,553.20 × 91,129.60
  4. Step 4: Simplify right side
    138,368.80x = 18,914,240,094.72
  5. Step 5: Solve for x
    x = 18,914,240,094.72/138,368.80
  6. Step 6: Final answer
    x = 136,694.40

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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.