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Finding the Fourth Proportional to 76.08, 105 and 47

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Solution

The fourth proportional to 76.08, 105 and 47 is: 64.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.08 : 105 = 47 : x
  2. Step 2: Convert to fraction form
    76.08/105 = 47/x
  3. Step 3: Cross multiply
    76.08x = 105 × 47
  4. Step 4: Simplify right side
    76.08x = 4,935
  5. Step 5: Solve for x
    x = 4,935/76.08
  6. Step 6: Final answer
    x = 64.87

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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.