Home / 129,114.45-178,148.75-78,125.90

Finding the Fourth Proportional to 129,114.45, 178,148.75 and 78,125.90

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Solution

The fourth proportional to 129,114.45, 178,148.75 and 78,125.90 is: 107,796.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,114.45 : 178,148.75 = 78,125.90 : x
  2. Step 2: Convert to fraction form
    129,114.45/178,148.75 = 78,125.90/x
  3. Step 3: Cross multiply
    129,114.45x = 178,148.75 × 78,125.90
  4. Step 4: Simplify right side
    129,114.45x = 13,918,030,146.25
  5. Step 5: Solve for x
    x = 13,918,030,146.25/129,114.45
  6. Step 6: Final answer
    x = 107,796.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.