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Finding the Fourth Proportional to 97.72, 145.70 and 91.51

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Solution

The fourth proportional to 97.72, 145.70 and 91.51 is: 136.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.72 : 145.70 = 91.51 : x
  2. Step 2: Convert to fraction form
    97.72/145.70 = 91.51/x
  3. Step 3: Cross multiply
    97.72x = 145.70 × 91.51
  4. Step 4: Simplify right side
    97.72x = 13,333.01
  5. Step 5: Solve for x
    x = 13,333.01/97.72
  6. Step 6: Final answer
    x = 136.44

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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.