Home / 81,429.10-122,139.60-41,990.20

Finding the Fourth Proportional to 81,429.10, 122,139.60 and 41,990.20

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Solution

The fourth proportional to 81,429.10, 122,139.60 and 41,990.20 is: 62,983.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,429.10 : 122,139.60 = 41,990.20 : x
  2. Step 2: Convert to fraction form
    81,429.10/122,139.60 = 41,990.20/x
  3. Step 3: Cross multiply
    81,429.10x = 122,139.60 × 41,990.20
  4. Step 4: Simplify right side
    81,429.10x = 5,128,666,231.92
  5. Step 5: Solve for x
    x = 5,128,666,231.92/81,429.10
  6. Step 6: Final answer
    x = 62,983.21

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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.