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Finding the Fourth Proportional to 121,327.20, 181,990.80 and 77,040.45

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Solution

The fourth proportional to 121,327.20, 181,990.80 and 77,040.45 is: 115,560.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,327.20 : 181,990.80 = 77,040.45 : x
  2. Step 2: Convert to fraction form
    121,327.20/181,990.80 = 77,040.45/x
  3. Step 3: Cross multiply
    121,327.20x = 181,990.80 × 77,040.45
  4. Step 4: Simplify right side
    121,327.20x = 14,020,653,127.86
  5. Step 5: Solve for x
    x = 14,020,653,127.86/121,327.20
  6. Step 6: Final answer
    x = 115,560.68

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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.