Home / 90,865.20-136,168.20-66,986.40

Finding the Fourth Proportional to 90,865.20, 136,168.20 and 66,986.40

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Solution

The fourth proportional to 90,865.20, 136,168.20 and 66,986.40 is: 100,384.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,865.20 : 136,168.20 = 66,986.40 : x
  2. Step 2: Convert to fraction form
    90,865.20/136,168.20 = 66,986.40/x
  3. Step 3: Cross multiply
    90,865.20x = 136,168.20 × 66,986.40
  4. Step 4: Simplify right side
    90,865.20x = 9,121,417,512.48
  5. Step 5: Solve for x
    x = 9,121,417,512.48/90,865.20
  6. Step 6: Final answer
    x = 100,384.06

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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.