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Finding the Fourth Proportional to 66.78, 92.13 and 64.35

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Solution

The fourth proportional to 66.78, 92.13 and 64.35 is: 88.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.78 : 92.13 = 64.35 : x
  2. Step 2: Convert to fraction form
    66.78/92.13 = 64.35/x
  3. Step 3: Cross multiply
    66.78x = 92.13 × 64.35
  4. Step 4: Simplify right side
    66.78x = 5,928.57
  5. Step 5: Solve for x
    x = 5,928.57/66.78
  6. Step 6: Final answer
    x = 88.78

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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.