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Finding the Fourth Proportional to 70.99, 97.86 and 61.11

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Solution

The fourth proportional to 70.99, 97.86 and 61.11 is: 84.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.99 : 97.86 = 61.11 : x
  2. Step 2: Convert to fraction form
    70.99/97.86 = 61.11/x
  3. Step 3: Cross multiply
    70.99x = 97.86 × 61.11
  4. Step 4: Simplify right side
    70.99x = 5,980.22
  5. Step 5: Solve for x
    x = 5,980.22/70.99
  6. Step 6: Final answer
    x = 84.24

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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.