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Finding the Fourth Proportional to 121,143.40, 181,715.10 and 87,682.30

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Solution

The fourth proportional to 121,143.40, 181,715.10 and 87,682.30 is: 131,523.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,143.40 : 181,715.10 = 87,682.30 : x
  2. Step 2: Convert to fraction form
    121,143.40/181,715.10 = 87,682.30/x
  3. Step 3: Cross multiply
    121,143.40x = 181,715.10 × 87,682.30
  4. Step 4: Simplify right side
    121,143.40x = 15,933,197,912.73
  5. Step 5: Solve for x
    x = 15,933,197,912.73/121,143.40
  6. Step 6: Final answer
    x = 131,523.45

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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.