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Finding the Fourth Proportional to 90.77, 124.52 and 88.47

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Solution

The fourth proportional to 90.77, 124.52 and 88.47 is: 121.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.77 : 124.52 = 88.47 : x
  2. Step 2: Convert to fraction form
    90.77/124.52 = 88.47/x
  3. Step 3: Cross multiply
    90.77x = 124.52 × 88.47
  4. Step 4: Simplify right side
    90.77x = 11,015.84
  5. Step 5: Solve for x
    x = 11,015.84/90.77
  6. Step 6: Final answer
    x = 121.37

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.