Home / 81,000.78-121,530.33-28,418.46

Finding the Fourth Proportional to 81,000.78, 121,530.33 and 28,418.46

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Solution

The fourth proportional to 81,000.78, 121,530.33 and 28,418.46 is: 42,637.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.78 : 121,530.33 = 28,418.46 : x
  2. Step 2: Convert to fraction form
    81,000.78/121,530.33 = 28,418.46/x
  3. Step 3: Cross multiply
    81,000.78x = 121,530.33 × 28,418.46
  4. Step 4: Simplify right side
    81,000.78x = 3,453,704,821.89
  5. Step 5: Solve for x
    x = 3,453,704,821.89/81,000.78
  6. Step 6: Final answer
    x = 42,637.92

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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.