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Finding the Fourth Proportional to 7.18, 9.90 and 6.30

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Solution

The fourth proportional to 7.18, 9.90 and 6.30 is: 8.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.18 : 9.90 = 6.30 : x
  2. Step 2: Convert to fraction form
    7.18/9.90 = 6.30/x
  3. Step 3: Cross multiply
    7.18x = 9.90 × 6.30
  4. Step 4: Simplify right side
    7.18x = 62.36
  5. Step 5: Solve for x
    x = 62.36/7.18
  6. Step 6: Final answer
    x = 8.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.