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Finding the Fourth Proportional to 71.93, 99.89 and 70

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Solution

The fourth proportional to 71.93, 99.89 and 70 is: 97.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.93 : 99.89 = 70 : x
  2. Step 2: Convert to fraction form
    71.93/99.89 = 70/x
  3. Step 3: Cross multiply
    71.93x = 99.89 × 70
  4. Step 4: Simplify right side
    71.93x = 6,992.30
  5. Step 5: Solve for x
    x = 6,992.30/71.93
  6. Step 6: Final answer
    x = 97.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.