Home / 81,153.20-121,720.20-21,985.20

Finding the Fourth Proportional to 81,153.20, 121,720.20 and 21,985.20

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Solution

The fourth proportional to 81,153.20, 121,720.20 and 21,985.20 is: 32,975.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,153.20 : 121,720.20 = 21,985.20 : x
  2. Step 2: Convert to fraction form
    81,153.20/121,720.20 = 21,985.20/x
  3. Step 3: Cross multiply
    81,153.20x = 121,720.20 × 21,985.20
  4. Step 4: Simplify right side
    81,153.20x = 2,676,042,941.04
  5. Step 5: Solve for x
    x = 2,676,042,941.04/81,153.20
  6. Step 6: Final answer
    x = 32,975.20

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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.