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Finding the Fourth Proportional to 47.86, 72.17 and 45.34

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Solution

The fourth proportional to 47.86, 72.17 and 45.34 is: 68.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.86 : 72.17 = 45.34 : x
  2. Step 2: Convert to fraction form
    47.86/72.17 = 45.34/x
  3. Step 3: Cross multiply
    47.86x = 72.17 × 45.34
  4. Step 4: Simplify right side
    47.86x = 3,272.19
  5. Step 5: Solve for x
    x = 3,272.19/47.86
  6. Step 6: Final answer
    x = 68.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.