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Finding the Fourth Proportional to 88.35, 121.83 and 78.53

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Solution

The fourth proportional to 88.35, 121.83 and 78.53 is: 108.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.35 : 121.83 = 78.53 : x
  2. Step 2: Convert to fraction form
    88.35/121.83 = 78.53/x
  3. Step 3: Cross multiply
    88.35x = 121.83 × 78.53
  4. Step 4: Simplify right side
    88.35x = 9,566.70
  5. Step 5: Solve for x
    x = 9,566.70/88.35
  6. Step 6: Final answer
    x = 108.28

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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.