Home / 81,209.52-121,821.30-28,619.46

Finding the Fourth Proportional to 81,209.52, 121,821.30 and 28,619.46

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Solution

The fourth proportional to 81,209.52, 121,821.30 and 28,619.46 is: 42,931.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,209.52 : 121,821.30 = 28,619.46 : x
  2. Step 2: Convert to fraction form
    81,209.52/121,821.30 = 28,619.46/x
  3. Step 3: Cross multiply
    81,209.52x = 121,821.30 × 28,619.46
  4. Step 4: Simplify right side
    81,209.52x = 3,486,459,822.50
  5. Step 5: Solve for x
    x = 3,486,459,822.50/81,209.52
  6. Step 6: Final answer
    x = 42,931.66

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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.