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Finding the Fourth Proportional to 121,130.60, 181,803.90 and 71,148.20

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Solution

The fourth proportional to 121,130.60, 181,803.90 and 71,148.20 is: 106,785.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,130.60 : 181,803.90 = 71,148.20 : x
  2. Step 2: Convert to fraction form
    121,130.60/181,803.90 = 71,148.20/x
  3. Step 3: Cross multiply
    121,130.60x = 181,803.90 × 71,148.20
  4. Step 4: Simplify right side
    121,130.60x = 12,935,020,237.98
  5. Step 5: Solve for x
    x = 12,935,020,237.98/121,130.60
  6. Step 6: Final answer
    x = 106,785.74

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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.