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Finding the Fourth Proportional to 6.30, 9.40 and 5.30

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Solution

The fourth proportional to 6.30, 9.40 and 5.30 is: 7.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.30 : 9.40 = 5.30 : x
  2. Step 2: Convert to fraction form
    6.30/9.40 = 5.30/x
  3. Step 3: Cross multiply
    6.30x = 9.40 × 5.30
  4. Step 4: Simplify right side
    6.30x = 49.82
  5. Step 5: Solve for x
    x = 49.82/6.30
  6. Step 6: Final answer
    x = 7.91

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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.