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Finding the Fourth Proportional to 91.51, 137.03 and 45.79

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Solution

The fourth proportional to 91.51, 137.03 and 45.79 is: 68.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.51 : 137.03 = 45.79 : x
  2. Step 2: Convert to fraction form
    91.51/137.03 = 45.79/x
  3. Step 3: Cross multiply
    91.51x = 137.03 × 45.79
  4. Step 4: Simplify right side
    91.51x = 6,274.03
  5. Step 5: Solve for x
    x = 6,274.03/91.51
  6. Step 6: Final answer
    x = 68.56

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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.