Home / 78,720.80-118,081.20-74,456.15

Finding the Fourth Proportional to 78,720.80, 118,081.20 and 74,456.15

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Solution

The fourth proportional to 78,720.80, 118,081.20 and 74,456.15 is: 111,684.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.80 : 118,081.20 = 74,456.15 : x
  2. Step 2: Convert to fraction form
    78,720.80/118,081.20 = 74,456.15/x
  3. Step 3: Cross multiply
    78,720.80x = 118,081.20 × 74,456.15
  4. Step 4: Simplify right side
    78,720.80x = 8,791,871,539.38
  5. Step 5: Solve for x
    x = 8,791,871,539.38/78,720.80
  6. Step 6: Final answer
    x = 111,684.23

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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.