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Finding the Fourth Proportional to 66.08, 98.48 and 65.78

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Solution

The fourth proportional to 66.08, 98.48 and 65.78 is: 98.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.08 : 98.48 = 65.78 : x
  2. Step 2: Convert to fraction form
    66.08/98.48 = 65.78/x
  3. Step 3: Cross multiply
    66.08x = 98.48 × 65.78
  4. Step 4: Simplify right side
    66.08x = 6,478.01
  5. Step 5: Solve for x
    x = 6,478.01/66.08
  6. Step 6: Final answer
    x = 98.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.