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Finding the Fourth Proportional to 68.40, 93.93 and 57.47

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Solution

The fourth proportional to 68.40, 93.93 and 57.47 is: 78.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.40 : 93.93 = 57.47 : x
  2. Step 2: Convert to fraction form
    68.40/93.93 = 57.47/x
  3. Step 3: Cross multiply
    68.40x = 93.93 × 57.47
  4. Step 4: Simplify right side
    68.40x = 5,397.69
  5. Step 5: Solve for x
    x = 5,397.69/68.40
  6. Step 6: Final answer
    x = 78.91

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These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.