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Finding the Fourth Proportional to 68.65, 94.80 and 55.70

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Solution

The fourth proportional to 68.65, 94.80 and 55.70 is: 76.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.65 : 94.80 = 55.70 : x
  2. Step 2: Convert to fraction form
    68.65/94.80 = 55.70/x
  3. Step 3: Cross multiply
    68.65x = 94.80 × 55.70
  4. Step 4: Simplify right side
    68.65x = 5,280.98
  5. Step 5: Solve for x
    x = 5,280.98/68.65
  6. Step 6: Final answer
    x = 76.93

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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.