Home / 90,869.20-136,534.20-80,731.60

Finding the Fourth Proportional to 90,869.20, 136,534.20 and 80,731.60

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Solution

The fourth proportional to 90,869.20, 136,534.20 and 80,731.60 is: 121,302.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,869.20 : 136,534.20 = 80,731.60 : x
  2. Step 2: Convert to fraction form
    90,869.20/136,534.20 = 80,731.60/x
  3. Step 3: Cross multiply
    90,869.20x = 136,534.20 × 80,731.60
  4. Step 4: Simplify right side
    90,869.20x = 11,022,624,420.72
  5. Step 5: Solve for x
    x = 11,022,624,420.72/90,869.20
  6. Step 6: Final answer
    x = 121,302.10

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1.5x scale

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.