Home / 81,293.60-121,989-28,747.28

Finding the Fourth Proportional to 81,293.60, 121,989 and 28,747.28

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Solution

The fourth proportional to 81,293.60, 121,989 and 28,747.28 is: 43,138.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,293.60 : 121,989 = 28,747.28 : x
  2. Step 2: Convert to fraction form
    81,293.60/121,989 = 28,747.28/x
  3. Step 3: Cross multiply
    81,293.60x = 121,989 × 28,747.28
  4. Step 4: Simplify right side
    81,293.60x = 3,506,851,939.92
  5. Step 5: Solve for x
    x = 3,506,851,939.92/81,293.60
  6. Step 6: Final answer
    x = 43,138.11

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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.