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Finding the Fourth Proportional to 66.39, 91.60 and 43.09

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Solution

The fourth proportional to 66.39, 91.60 and 43.09 is: 59.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.39 : 91.60 = 43.09 : x
  2. Step 2: Convert to fraction form
    66.39/91.60 = 43.09/x
  3. Step 3: Cross multiply
    66.39x = 91.60 × 43.09
  4. Step 4: Simplify right side
    66.39x = 3,947.04
  5. Step 5: Solve for x
    x = 3,947.04/66.39
  6. Step 6: Final answer
    x = 59.45

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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.