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Finding the Fourth Proportional to 66.89, 92.36 and 57.78

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Solution

The fourth proportional to 66.89, 92.36 and 57.78 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.89 : 92.36 = 57.78 : x
  2. Step 2: Convert to fraction form
    66.89/92.36 = 57.78/x
  3. Step 3: Cross multiply
    66.89x = 92.36 × 57.78
  4. Step 4: Simplify right side
    66.89x = 5,336.71
  5. Step 5: Solve for x
    x = 5,336.71/66.89
  6. Step 6: Final answer
    x = 79.78

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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.