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Finding the Fourth Proportional to 88.90, 122.69 and 49.56

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Solution

The fourth proportional to 88.90, 122.69 and 49.56 is: 68.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.90 : 122.69 = 49.56 : x
  2. Step 2: Convert to fraction form
    88.90/122.69 = 49.56/x
  3. Step 3: Cross multiply
    88.90x = 122.69 × 49.56
  4. Step 4: Simplify right side
    88.90x = 6,080.52
  5. Step 5: Solve for x
    x = 6,080.52/88.90
  6. Step 6: Final answer
    x = 68.40

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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.