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Finding the Fourth Proportional to 11.30, 15.59 and 6.45

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Solution

The fourth proportional to 11.30, 15.59 and 6.45 is: 8.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.30 : 15.59 = 6.45 : x
  2. Step 2: Convert to fraction form
    11.30/15.59 = 6.45/x
  3. Step 3: Cross multiply
    11.30x = 15.59 × 6.45
  4. Step 4: Simplify right side
    11.30x = 100.48
  5. Step 5: Solve for x
    x = 100.48/11.30
  6. Step 6: Final answer
    x = 8.90

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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.