Home / 80,921.36-121,437-28,330.64

Finding the Fourth Proportional to 80,921.36, 121,437 and 28,330.64

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Solution

The fourth proportional to 80,921.36, 121,437 and 28,330.64 is: 42,515.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,921.36 : 121,437 = 28,330.64 : x
  2. Step 2: Convert to fraction form
    80,921.36/121,437 = 28,330.64/x
  3. Step 3: Cross multiply
    80,921.36x = 121,437 × 28,330.64
  4. Step 4: Simplify right side
    80,921.36x = 3,440,387,929.68
  5. Step 5: Solve for x
    x = 3,440,387,929.68/80,921.36
  6. Step 6: Final answer
    x = 42,515.20

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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.