Home / 78,153.28-117,180-66,311.04

Finding the Fourth Proportional to 78,153.28, 117,180 and 66,311.04

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Solution

The fourth proportional to 78,153.28, 117,180 and 66,311.04 is: 99,424.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,153.28 : 117,180 = 66,311.04 : x
  2. Step 2: Convert to fraction form
    78,153.28/117,180 = 66,311.04/x
  3. Step 3: Cross multiply
    78,153.28x = 117,180 × 66,311.04
  4. Step 4: Simplify right side
    78,153.28x = 7,770,327,667.20
  5. Step 5: Solve for x
    x = 7,770,327,667.20/78,153.28
  6. Step 6: Final answer
    x = 99,424.20

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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.