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Finding the Fourth Proportional to 88.98, 122.78 and 56.28

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Solution

The fourth proportional to 88.98, 122.78 and 56.28 is: 77.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.98 : 122.78 = 56.28 : x
  2. Step 2: Convert to fraction form
    88.98/122.78 = 56.28/x
  3. Step 3: Cross multiply
    88.98x = 122.78 × 56.28
  4. Step 4: Simplify right side
    88.98x = 6,910.06
  5. Step 5: Solve for x
    x = 6,910.06/88.98
  6. Step 6: Final answer
    x = 77.66

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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.