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Finding the Fourth Proportional to 68.68, 94.80 and 53.89

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Solution

The fourth proportional to 68.68, 94.80 and 53.89 is: 74.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.68 : 94.80 = 53.89 : x
  2. Step 2: Convert to fraction form
    68.68/94.80 = 53.89/x
  3. Step 3: Cross multiply
    68.68x = 94.80 × 53.89
  4. Step 4: Simplify right side
    68.68x = 5,108.74
  5. Step 5: Solve for x
    x = 5,108.74/68.68
  6. Step 6: Final answer
    x = 74.39

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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.