Home / 81,423.11-122,689.32-66,956.10

Finding the Fourth Proportional to 81,423.11, 122,689.32 and 66,956.10

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Solution

The fourth proportional to 81,423.11, 122,689.32 and 66,956.10 is: 100,890.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,423.11 : 122,689.32 = 66,956.10 : x
  2. Step 2: Convert to fraction form
    81,423.11/122,689.32 = 66,956.10/x
  3. Step 3: Cross multiply
    81,423.11x = 122,689.32 × 66,956.10
  4. Step 4: Simplify right side
    81,423.11x = 8,214,798,378.85
  5. Step 5: Solve for x
    x = 8,214,798,378.85/81,423.11
  6. Step 6: Final answer
    x = 100,890.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.