Home / 81,156.53-121,730.24-21,987.86

Finding the Fourth Proportional to 81,156.53, 121,730.24 and 21,987.86

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Solution

The fourth proportional to 81,156.53, 121,730.24 and 21,987.86 is: 32,980.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,156.53 : 121,730.24 = 21,987.86 : x
  2. Step 2: Convert to fraction form
    81,156.53/121,730.24 = 21,987.86/x
  3. Step 3: Cross multiply
    81,156.53x = 121,730.24 × 21,987.86
  4. Step 4: Simplify right side
    81,156.53x = 2,676,586,921.20
  5. Step 5: Solve for x
    x = 2,676,586,921.20/81,156.53
  6. Step 6: Final answer
    x = 32,980.55

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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.