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Finding the Fourth Proportional to 70.95, 97.92 and 39.87

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Solution

The fourth proportional to 70.95, 97.92 and 39.87 is: 55.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.95 : 97.92 = 39.87 : x
  2. Step 2: Convert to fraction form
    70.95/97.92 = 39.87/x
  3. Step 3: Cross multiply
    70.95x = 97.92 × 39.87
  4. Step 4: Simplify right side
    70.95x = 3,904.07
  5. Step 5: Solve for x
    x = 3,904.07/70.95
  6. Step 6: Final answer
    x = 55.03

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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.