Home / 81,045.40-121,568.10-21,890.20

Finding the Fourth Proportional to 81,045.40, 121,568.10 and 21,890.20

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Solution

The fourth proportional to 81,045.40, 121,568.10 and 21,890.20 is: 32,835.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,045.40 : 121,568.10 = 21,890.20 : x
  2. Step 2: Convert to fraction form
    81,045.40/121,568.10 = 21,890.20/x
  3. Step 3: Cross multiply
    81,045.40x = 121,568.10 × 21,890.20
  4. Step 4: Simplify right side
    81,045.40x = 2,661,150,022.62
  5. Step 5: Solve for x
    x = 2,661,150,022.62/81,045.40
  6. Step 6: Final answer
    x = 32,835.30

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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.