Home / 81,015.10-121,522.65-45,439.90

Finding the Fourth Proportional to 81,015.10, 121,522.65 and 45,439.90

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Solution

The fourth proportional to 81,015.10, 121,522.65 and 45,439.90 is: 68,159.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,015.10 : 121,522.65 = 45,439.90 : x
  2. Step 2: Convert to fraction form
    81,015.10/121,522.65 = 45,439.90/x
  3. Step 3: Cross multiply
    81,015.10x = 121,522.65 × 45,439.90
  4. Step 4: Simplify right side
    81,015.10x = 5,521,977,063.74
  5. Step 5: Solve for x
    x = 5,521,977,063.74/81,015.10
  6. Step 6: Final answer
    x = 68,159.85

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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.