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Finding the Fourth Proportional to 70.77, 97.60 and 55.20

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Solution

The fourth proportional to 70.77, 97.60 and 55.20 is: 76.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.77 : 97.60 = 55.20 : x
  2. Step 2: Convert to fraction form
    70.77/97.60 = 55.20/x
  3. Step 3: Cross multiply
    70.77x = 97.60 × 55.20
  4. Step 4: Simplify right side
    70.77x = 5,387.52
  5. Step 5: Solve for x
    x = 5,387.52/70.77
  6. Step 6: Final answer
    x = 76.13

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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.