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Finding the Fourth Proportional to 97.31, 134.45 and 85.01

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Solution

The fourth proportional to 97.31, 134.45 and 85.01 is: 117.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.31 : 134.45 = 85.01 : x
  2. Step 2: Convert to fraction form
    97.31/134.45 = 85.01/x
  3. Step 3: Cross multiply
    97.31x = 134.45 × 85.01
  4. Step 4: Simplify right side
    97.31x = 11,428.50
  5. Step 5: Solve for x
    x = 11,428.50/97.31
  6. Step 6: Final answer
    x = 117.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.