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Finding the Fourth Proportional to 138,153.34, 207,221.55 and 81,258.71

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Solution

The fourth proportional to 138,153.34, 207,221.55 and 81,258.71 is: 121,883.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,153.34 : 207,221.55 = 81,258.71 : x
  2. Step 2: Convert to fraction form
    138,153.34/207,221.55 = 81,258.71/x
  3. Step 3: Cross multiply
    138,153.34x = 207,221.55 × 81,258.71
  4. Step 4: Simplify right side
    138,153.34x = 16,838,554,496.37
  5. Step 5: Solve for x
    x = 16,838,554,496.37/138,153.34
  6. Step 6: Final answer
    x = 121,883.08

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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.