Home / 81,445.12-122,063.28-70,871.20

Finding the Fourth Proportional to 81,445.12, 122,063.28 and 70,871.20

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Solution

The fourth proportional to 81,445.12, 122,063.28 and 70,871.20 is: 106,215.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,445.12 : 122,063.28 = 70,871.20 : x
  2. Step 2: Convert to fraction form
    81,445.12/122,063.28 = 70,871.20/x
  3. Step 3: Cross multiply
    81,445.12x = 122,063.28 × 70,871.20
  4. Step 4: Simplify right side
    81,445.12x = 8,650,771,129.54
  5. Step 5: Solve for x
    x = 8,650,771,129.54/81,445.12
  6. Step 6: Final answer
    x = 106,215.95

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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.