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Finding the Fourth Proportional to 70.49, 97.18 and 55.77

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Solution

The fourth proportional to 70.49, 97.18 and 55.77 is: 76.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.49 : 97.18 = 55.77 : x
  2. Step 2: Convert to fraction form
    70.49/97.18 = 55.77/x
  3. Step 3: Cross multiply
    70.49x = 97.18 × 55.77
  4. Step 4: Simplify right side
    70.49x = 5,419.59
  5. Step 5: Solve for x
    x = 5,419.59/70.49
  6. Step 6: Final answer
    x = 76.89

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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.