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Finding the Fourth Proportional to 7.84, 10.81 and 6.55

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Solution

The fourth proportional to 7.84, 10.81 and 6.55 is: 9.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.84 : 10.81 = 6.55 : x
  2. Step 2: Convert to fraction form
    7.84/10.81 = 6.55/x
  3. Step 3: Cross multiply
    7.84x = 10.81 × 6.55
  4. Step 4: Simplify right side
    7.84x = 70.81
  5. Step 5: Solve for x
    x = 70.81/7.84
  6. Step 6: Final answer
    x = 9.03

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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.