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Finding the Fourth Proportional to 5.21, 7.77 and 4.89

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Solution

The fourth proportional to 5.21, 7.77 and 4.89 is: 7.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.21 : 7.77 = 4.89 : x
  2. Step 2: Convert to fraction form
    5.21/7.77 = 4.89/x
  3. Step 3: Cross multiply
    5.21x = 7.77 × 4.89
  4. Step 4: Simplify right side
    5.21x = 38.00
  5. Step 5: Solve for x
    x = 38.00/5.21
  6. Step 6: Final answer
    x = 7.29

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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.