Home / 81,020.34-121,542.66-28,420.56

Finding the Fourth Proportional to 81,020.34, 121,542.66 and 28,420.56

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Solution

The fourth proportional to 81,020.34, 121,542.66 and 28,420.56 is: 42,635.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.34 : 121,542.66 = 28,420.56 : x
  2. Step 2: Convert to fraction form
    81,020.34/121,542.66 = 28,420.56/x
  3. Step 3: Cross multiply
    81,020.34x = 121,542.66 × 28,420.56
  4. Step 4: Simplify right side
    81,020.34x = 3,454,310,461.09
  5. Step 5: Solve for x
    x = 3,454,310,461.09/81,020.34
  6. Step 6: Final answer
    x = 42,635.10

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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.