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Finding the Fourth Proportional to 218,315.72, 301,275.65 and 121,517.49

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Solution

The fourth proportional to 218,315.72, 301,275.65 and 121,517.49 is: 167,694.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,315.72 : 301,275.65 = 121,517.49 : x
  2. Step 2: Convert to fraction form
    218,315.72/301,275.65 = 121,517.49/x
  3. Step 3: Cross multiply
    218,315.72x = 301,275.65 × 121,517.49
  4. Step 4: Simplify right side
    218,315.72x = 36,610,258,672.15
  5. Step 5: Solve for x
    x = 36,610,258,672.15/218,315.72
  6. Step 6: Final answer
    x = 167,694.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.