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Finding the Fourth Proportional to 5, 7.45 and 4.78

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Solution

The fourth proportional to 5, 7.45 and 4.78 is: 7.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    5 : 7.45 = 4.78 : x
  2. Step 2: Convert to fraction form
    5/7.45 = 4.78/x
  3. Step 3: Cross multiply
    5x = 7.45 × 4.78
  4. Step 4: Simplify right side
    5x = 35.61
  5. Step 5: Solve for x
    x = 35.61/5
  6. Step 6: Final answer
    x = 7.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.