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Finding the Fourth Proportional to 75.43, 103.99 and 47.78

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Solution

The fourth proportional to 75.43, 103.99 and 47.78 is: 65.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.43 : 103.99 = 47.78 : x
  2. Step 2: Convert to fraction form
    75.43/103.99 = 47.78/x
  3. Step 3: Cross multiply
    75.43x = 103.99 × 47.78
  4. Step 4: Simplify right side
    75.43x = 4,968.40
  5. Step 5: Solve for x
    x = 4,968.40/75.43
  6. Step 6: Final answer
    x = 65.87

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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.