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Finding the Fourth Proportional to 11.90, 16.40 and 9.47

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Solution

The fourth proportional to 11.90, 16.40 and 9.47 is: 13.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.90 : 16.40 = 9.47 : x
  2. Step 2: Convert to fraction form
    11.90/16.40 = 9.47/x
  3. Step 3: Cross multiply
    11.90x = 16.40 × 9.47
  4. Step 4: Simplify right side
    11.90x = 155.31
  5. Step 5: Solve for x
    x = 155.31/11.90
  6. Step 6: Final answer
    x = 13.05

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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.