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Finding the Fourth Proportional to 88, 121.16 and 78.76

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Solution

The fourth proportional to 88, 121.16 and 78.76 is: 108.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    88 : 121.16 = 78.76 : x
  2. Step 2: Convert to fraction form
    88/121.16 = 78.76/x
  3. Step 3: Cross multiply
    88x = 121.16 × 78.76
  4. Step 4: Simplify right side
    88x = 9,542.56
  5. Step 5: Solve for x
    x = 9,542.56/88
  6. Step 6: Final answer
    x = 108.44

Related Problems

Find fourth proportional to 44, 60.58 and 39.38
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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.