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Finding the Fourth Proportional to 59.31, 81.77 and 47

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Solution

The fourth proportional to 59.31, 81.77 and 47 is: 64.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.31 : 81.77 = 47 : x
  2. Step 2: Convert to fraction form
    59.31/81.77 = 47/x
  3. Step 3: Cross multiply
    59.31x = 81.77 × 47
  4. Step 4: Simplify right side
    59.31x = 3,843.19
  5. Step 5: Solve for x
    x = 3,843.19/59.31
  6. Step 6: Final answer
    x = 64.80

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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.