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Finding the Fourth Proportional to 121,011.70, 181,517.55 and 87,574.90

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Solution

The fourth proportional to 121,011.70, 181,517.55 and 87,574.90 is: 131,362.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,011.70 : 181,517.55 = 87,574.90 : x
  2. Step 2: Convert to fraction form
    121,011.70/181,517.55 = 87,574.90/x
  3. Step 3: Cross multiply
    121,011.70x = 181,517.55 × 87,574.90
  4. Step 4: Simplify right side
    121,011.70x = 15,896,381,289.50
  5. Step 5: Solve for x
    x = 15,896,381,289.50/121,011.70
  6. Step 6: Final answer
    x = 131,362.35

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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.