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Finding the Fourth Proportional to 7.65, 10.55 and 4.19

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Solution

The fourth proportional to 7.65, 10.55 and 4.19 is: 5.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.65 : 10.55 = 4.19 : x
  2. Step 2: Convert to fraction form
    7.65/10.55 = 4.19/x
  3. Step 3: Cross multiply
    7.65x = 10.55 × 4.19
  4. Step 4: Simplify right side
    7.65x = 44.26
  5. Step 5: Solve for x
    x = 44.26/7.65
  6. Step 6: Final answer
    x = 5.79

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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.