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Finding the Fourth Proportional to 66.68, 100.02 and 21.01

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Solution

The fourth proportional to 66.68, 100.02 and 21.01 is: 31.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.68 : 100.02 = 21.01 : x
  2. Step 2: Convert to fraction form
    66.68/100.02 = 21.01/x
  3. Step 3: Cross multiply
    66.68x = 100.02 × 21.01
  4. Step 4: Simplify right side
    66.68x = 2,101.42
  5. Step 5: Solve for x
    x = 2,101.42/66.68
  6. Step 6: Final answer
    x = 31.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.