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Finding the Fourth Proportional to 70.87, 97.89 and 55.52

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Solution

The fourth proportional to 70.87, 97.89 and 55.52 is: 76.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.87 : 97.89 = 55.52 : x
  2. Step 2: Convert to fraction form
    70.87/97.89 = 55.52/x
  3. Step 3: Cross multiply
    70.87x = 97.89 × 55.52
  4. Step 4: Simplify right side
    70.87x = 5,434.36
  5. Step 5: Solve for x
    x = 5,434.36/70.87
  6. Step 6: Final answer
    x = 76.69

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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.