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Finding the Fourth Proportional to 90,983.20, 136,474.80 and 75,431.20

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Solution

The fourth proportional to 90,983.20, 136,474.80 and 75,431.20 is: 113,146.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,983.20 : 136,474.80 = 75,431.20 : x
  2. Step 2: Convert to fraction form
    90,983.20/136,474.80 = 75,431.20/x
  3. Step 3: Cross multiply
    90,983.20x = 136,474.80 × 75,431.20
  4. Step 4: Simplify right side
    90,983.20x = 10,294,457,933.76
  5. Step 5: Solve for x
    x = 10,294,457,933.76/90,983.20
  6. Step 6: Final answer
    x = 113,146.80

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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.