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Finding the Fourth Proportional to 68.40, 94.20 and 57.46

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Solution

The fourth proportional to 68.40, 94.20 and 57.46 is: 79.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.40 : 94.20 = 57.46 : x
  2. Step 2: Convert to fraction form
    68.40/94.20 = 57.46/x
  3. Step 3: Cross multiply
    68.40x = 94.20 × 57.46
  4. Step 4: Simplify right side
    68.40x = 5,412.73
  5. Step 5: Solve for x
    x = 5,412.73/68.40
  6. Step 6: Final answer
    x = 79.13

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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.