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Finding the Fourth Proportional to 5.69, 7.85 and 3.26

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Solution

The fourth proportional to 5.69, 7.85 and 3.26 is: 4.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.69 : 7.85 = 3.26 : x
  2. Step 2: Convert to fraction form
    5.69/7.85 = 3.26/x
  3. Step 3: Cross multiply
    5.69x = 7.85 × 3.26
  4. Step 4: Simplify right side
    5.69x = 25.61
  5. Step 5: Solve for x
    x = 25.61/5.69
  6. Step 6: Final answer
    x = 4.50

Related Problems

Find fourth proportional to 2.84, 3.93 and 1.63
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Double scale
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1.5x scale

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.