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Finding the Fourth Proportional to 9.45, 13 and 7.40

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Solution

The fourth proportional to 9.45, 13 and 7.40 is: 10.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.45 : 13 = 7.40 : x
  2. Step 2: Convert to fraction form
    9.45/13 = 7.40/x
  3. Step 3: Cross multiply
    9.45x = 13 × 7.40
  4. Step 4: Simplify right side
    9.45x = 96.14
  5. Step 5: Solve for x
    x = 96.14/9.45
  6. Step 6: Final answer
    x = 10.18

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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.