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Finding the Fourth Proportional to 4.74, 7.08 and 3.89

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Solution

The fourth proportional to 4.74, 7.08 and 3.89 is: 5.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.74 : 7.08 = 3.89 : x
  2. Step 2: Convert to fraction form
    4.74/7.08 = 3.89/x
  3. Step 3: Cross multiply
    4.74x = 7.08 × 3.89
  4. Step 4: Simplify right side
    4.74x = 27.49
  5. Step 5: Solve for x
    x = 27.49/4.74
  6. Step 6: Final answer
    x = 5.80

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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.