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Finding the Fourth Proportional to 121,788.80, 182,990.40 and 77,436.80

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Solution

The fourth proportional to 121,788.80, 182,990.40 and 77,436.80 is: 116,350.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,788.80 : 182,990.40 = 77,436.80 : x
  2. Step 2: Convert to fraction form
    121,788.80/182,990.40 = 77,436.80/x
  3. Step 3: Cross multiply
    121,788.80x = 182,990.40 × 77,436.80
  4. Step 4: Simplify right side
    121,788.80x = 14,170,191,006.72
  5. Step 5: Solve for x
    x = 14,170,191,006.72/121,788.80
  6. Step 6: Final answer
    x = 116,350.53

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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.