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Finding the Fourth Proportional to 111.25, 153.56 and 90.51

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Solution

The fourth proportional to 111.25, 153.56 and 90.51 is: 124.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.25 : 153.56 = 90.51 : x
  2. Step 2: Convert to fraction form
    111.25/153.56 = 90.51/x
  3. Step 3: Cross multiply
    111.25x = 153.56 × 90.51
  4. Step 4: Simplify right side
    111.25x = 13,898.72
  5. Step 5: Solve for x
    x = 13,898.72/111.25
  6. Step 6: Final answer
    x = 124.93

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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.