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Finding the Fourth Proportional to 47.86, 66.12 and 40.66

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Solution

The fourth proportional to 47.86, 66.12 and 40.66 is: 56.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.86 : 66.12 = 40.66 : x
  2. Step 2: Convert to fraction form
    47.86/66.12 = 40.66/x
  3. Step 3: Cross multiply
    47.86x = 66.12 × 40.66
  4. Step 4: Simplify right side
    47.86x = 2,688.44
  5. Step 5: Solve for x
    x = 2,688.44/47.86
  6. Step 6: Final answer
    x = 56.17

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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.