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Finding the Fourth Proportional to 5.76, 7.92 and 5.45

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Solution

The fourth proportional to 5.76, 7.92 and 5.45 is: 7.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.76 : 7.92 = 5.45 : x
  2. Step 2: Convert to fraction form
    5.76/7.92 = 5.45/x
  3. Step 3: Cross multiply
    5.76x = 7.92 × 5.45
  4. Step 4: Simplify right side
    5.76x = 43.12
  5. Step 5: Solve for x
    x = 43.12/5.76
  6. Step 6: Final answer
    x = 7.49

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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.