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Finding the Fourth Proportional to 66.08, 91.08 and 47.64

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Solution

The fourth proportional to 66.08, 91.08 and 47.64 is: 65.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.08 : 91.08 = 47.64 : x
  2. Step 2: Convert to fraction form
    66.08/91.08 = 47.64/x
  3. Step 3: Cross multiply
    66.08x = 91.08 × 47.64
  4. Step 4: Simplify right side
    66.08x = 4,339.05
  5. Step 5: Solve for x
    x = 4,339.05/66.08
  6. Step 6: Final answer
    x = 65.66

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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.