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Finding the Fourth Proportional to 5.02, 6.90 and 4.21

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Solution

The fourth proportional to 5.02, 6.90 and 4.21 is: 5.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.02 : 6.90 = 4.21 : x
  2. Step 2: Convert to fraction form
    5.02/6.90 = 4.21/x
  3. Step 3: Cross multiply
    5.02x = 6.90 × 4.21
  4. Step 4: Simplify right side
    5.02x = 29.05
  5. Step 5: Solve for x
    x = 29.05/5.02
  6. Step 6: Final answer
    x = 5.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.