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Finding the Fourth Proportional to 64.61, 97.31 and 57.08

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Solution

The fourth proportional to 64.61, 97.31 and 57.08 is: 85.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.61 : 97.31 = 57.08 : x
  2. Step 2: Convert to fraction form
    64.61/97.31 = 57.08/x
  3. Step 3: Cross multiply
    64.61x = 97.31 × 57.08
  4. Step 4: Simplify right side
    64.61x = 5,554.45
  5. Step 5: Solve for x
    x = 5,554.45/64.61
  6. Step 6: Final answer
    x = 85.97

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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.