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Finding the Fourth Proportional to 100.40, 149.98 and 74.58

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Solution

The fourth proportional to 100.40, 149.98 and 74.58 is: 111.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.40 : 149.98 = 74.58 : x
  2. Step 2: Convert to fraction form
    100.40/149.98 = 74.58/x
  3. Step 3: Cross multiply
    100.40x = 149.98 × 74.58
  4. Step 4: Simplify right side
    100.40x = 11,185.14
  5. Step 5: Solve for x
    x = 11,185.14/100.40
  6. Step 6: Final answer
    x = 111.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.