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Finding the Fourth Proportional to 66.68, 100.58 and 66

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Solution

The fourth proportional to 66.68, 100.58 and 66 is: 99.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.68 : 100.58 = 66 : x
  2. Step 2: Convert to fraction form
    66.68/100.58 = 66/x
  3. Step 3: Cross multiply
    66.68x = 100.58 × 66
  4. Step 4: Simplify right side
    66.68x = 6,638.28
  5. Step 5: Solve for x
    x = 6,638.28/66.68
  6. Step 6: Final answer
    x = 99.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.