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Finding the Fourth Proportional to 66.63, 91.86 and 48.18

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Solution

The fourth proportional to 66.63, 91.86 and 48.18 is: 66.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.63 : 91.86 = 48.18 : x
  2. Step 2: Convert to fraction form
    66.63/91.86 = 48.18/x
  3. Step 3: Cross multiply
    66.63x = 91.86 × 48.18
  4. Step 4: Simplify right side
    66.63x = 4,425.81
  5. Step 5: Solve for x
    x = 4,425.81/66.63
  6. Step 6: Final answer
    x = 66.42

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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.