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Finding the Fourth Proportional to 68, 93.80 and 55.60

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Solution

The fourth proportional to 68, 93.80 and 55.60 is: 76.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68 : 93.80 = 55.60 : x
  2. Step 2: Convert to fraction form
    68/93.80 = 55.60/x
  3. Step 3: Cross multiply
    68x = 93.80 × 55.60
  4. Step 4: Simplify right side
    68x = 5,215.28
  5. Step 5: Solve for x
    x = 5,215.28/68
  6. Step 6: Final answer
    x = 76.70

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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.