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Finding the Fourth Proportional to 121,505.70, 182,258.55 and 91,981.20

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Solution

The fourth proportional to 121,505.70, 182,258.55 and 91,981.20 is: 137,971.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,505.70 : 182,258.55 = 91,981.20 : x
  2. Step 2: Convert to fraction form
    121,505.70/182,258.55 = 91,981.20/x
  3. Step 3: Cross multiply
    121,505.70x = 182,258.55 × 91,981.20
  4. Step 4: Simplify right side
    121,505.70x = 16,764,360,139.26
  5. Step 5: Solve for x
    x = 16,764,360,139.26/121,505.70
  6. Step 6: Final answer
    x = 137,971.80

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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.