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Finding the Fourth Proportional to 121,576.80, 167,851.80 and 78,578.76

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Solution

The fourth proportional to 121,576.80, 167,851.80 and 78,578.76 is: 108,487.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,576.80 : 167,851.80 = 78,578.76 : x
  2. Step 2: Convert to fraction form
    121,576.80/167,851.80 = 78,578.76/x
  3. Step 3: Cross multiply
    121,576.80x = 167,851.80 × 78,578.76
  4. Step 4: Simplify right side
    121,576.80x = 13,189,586,307.77
  5. Step 5: Solve for x
    x = 13,189,586,307.77/121,576.80
  6. Step 6: Final answer
    x = 108,487.69

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1.5x scale

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.