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Finding the Fourth Proportional to 5.61, 7.72 and 5.43

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Solution

The fourth proportional to 5.61, 7.72 and 5.43 is: 7.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.61 : 7.72 = 5.43 : x
  2. Step 2: Convert to fraction form
    5.61/7.72 = 5.43/x
  3. Step 3: Cross multiply
    5.61x = 7.72 × 5.43
  4. Step 4: Simplify right side
    5.61x = 41.92
  5. Step 5: Solve for x
    x = 41.92/5.61
  6. Step 6: Final answer
    x = 7.47

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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.