Home / 81,214.40-121,821.60-28,629.20

Finding the Fourth Proportional to 81,214.40, 121,821.60 and 28,629.20

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Solution

The fourth proportional to 81,214.40, 121,821.60 and 28,629.20 is: 42,943.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,214.40 : 121,821.60 = 28,629.20 : x
  2. Step 2: Convert to fraction form
    81,214.40/121,821.60 = 28,629.20/x
  3. Step 3: Cross multiply
    81,214.40x = 121,821.60 × 28,629.20
  4. Step 4: Simplify right side
    81,214.40x = 3,487,654,950.72
  5. Step 5: Solve for x
    x = 3,487,654,950.72/81,214.40
  6. Step 6: Final answer
    x = 42,943.80

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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.