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Finding the Fourth Proportional to 138,318.40, 207,477.60 and 91,079.20

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Solution

The fourth proportional to 138,318.40, 207,477.60 and 91,079.20 is: 136,618.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,318.40 : 207,477.60 = 91,079.20 : x
  2. Step 2: Convert to fraction form
    138,318.40/207,477.60 = 91,079.20/x
  3. Step 3: Cross multiply
    138,318.40x = 207,477.60 × 91,079.20
  4. Step 4: Simplify right side
    138,318.40x = 18,896,893,825.92
  5. Step 5: Solve for x
    x = 18,896,893,825.92/138,318.40
  6. Step 6: Final answer
    x = 136,618.80

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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.