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Finding the Fourth Proportional to 121,428.70, 182,143.05 and 91,904.20

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Solution

The fourth proportional to 121,428.70, 182,143.05 and 91,904.20 is: 137,856.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,428.70 : 182,143.05 = 91,904.20 : x
  2. Step 2: Convert to fraction form
    121,428.70/182,143.05 = 91,904.20/x
  3. Step 3: Cross multiply
    121,428.70x = 182,143.05 × 91,904.20
  4. Step 4: Simplify right side
    121,428.70x = 16,739,711,295.81
  5. Step 5: Solve for x
    x = 16,739,711,295.81/121,428.70
  6. Step 6: Final answer
    x = 137,856.30

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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.