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Finding the Fourth Proportional to 121,992.70, 182,632.65 and 87,000.70

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Solution

The fourth proportional to 121,992.70, 182,632.65 and 87,000.70 is: 130,246.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,992.70 : 182,632.65 = 87,000.70 : x
  2. Step 2: Convert to fraction form
    121,992.70/182,632.65 = 87,000.70/x
  3. Step 3: Cross multiply
    121,992.70x = 182,632.65 × 87,000.70
  4. Step 4: Simplify right side
    121,992.70x = 15,889,168,392.86
  5. Step 5: Solve for x
    x = 15,889,168,392.86/121,992.70
  6. Step 6: Final answer
    x = 130,246.88

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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.