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Finding the Fourth Proportional to 71.40, 97.90 and 70.11

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Solution

The fourth proportional to 71.40, 97.90 and 70.11 is: 96.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.40 : 97.90 = 70.11 : x
  2. Step 2: Convert to fraction form
    71.40/97.90 = 70.11/x
  3. Step 3: Cross multiply
    71.40x = 97.90 × 70.11
  4. Step 4: Simplify right side
    71.40x = 6,862.93
  5. Step 5: Solve for x
    x = 6,862.93/71.40
  6. Step 6: Final answer
    x = 96.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.