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Finding the Fourth Proportional to 100.68, 151.55 and 91.25

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Solution

The fourth proportional to 100.68, 151.55 and 91.25 is: 137.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.68 : 151.55 = 91.25 : x
  2. Step 2: Convert to fraction form
    100.68/151.55 = 91.25/x
  3. Step 3: Cross multiply
    100.68x = 151.55 × 91.25
  4. Step 4: Simplify right side
    100.68x = 13,828.63
  5. Step 5: Solve for x
    x = 13,828.63/100.68
  6. Step 6: Final answer
    x = 137.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.