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Finding the Fourth Proportional to 91.19, 136.74 and 30.31

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Solution

The fourth proportional to 91.19, 136.74 and 30.31 is: 45.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.19 : 136.74 = 30.31 : x
  2. Step 2: Convert to fraction form
    91.19/136.74 = 30.31/x
  3. Step 3: Cross multiply
    91.19x = 136.74 × 30.31
  4. Step 4: Simplify right side
    91.19x = 4,144.77
  5. Step 5: Solve for x
    x = 4,144.77/91.19
  6. Step 6: Final answer
    x = 45.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.