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Finding the Fourth Proportional to 5.18, 7.72 and 5.03

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Solution

The fourth proportional to 5.18, 7.72 and 5.03 is: 7.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.18 : 7.72 = 5.03 : x
  2. Step 2: Convert to fraction form
    5.18/7.72 = 5.03/x
  3. Step 3: Cross multiply
    5.18x = 7.72 × 5.03
  4. Step 4: Simplify right side
    5.18x = 38.83
  5. Step 5: Solve for x
    x = 38.83/5.18
  6. Step 6: Final answer
    x = 7.50

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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.