Home / 81,023.40-121,535.10-28,438.20

Finding the Fourth Proportional to 81,023.40, 121,535.10 and 28,438.20

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Solution

The fourth proportional to 81,023.40, 121,535.10 and 28,438.20 is: 42,657.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,023.40 : 121,535.10 = 28,438.20 : x
  2. Step 2: Convert to fraction form
    81,023.40/121,535.10 = 28,438.20/x
  3. Step 3: Cross multiply
    81,023.40x = 121,535.10 × 28,438.20
  4. Step 4: Simplify right side
    81,023.40x = 3,456,239,480.82
  5. Step 5: Solve for x
    x = 3,456,239,480.82/81,023.40
  6. Step 6: Final answer
    x = 42,657.30

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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.