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Finding the Fourth Proportional to 4.79, 6.61 and 4.19

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Solution

The fourth proportional to 4.79, 6.61 and 4.19 is: 5.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.79 : 6.61 = 4.19 : x
  2. Step 2: Convert to fraction form
    4.79/6.61 = 4.19/x
  3. Step 3: Cross multiply
    4.79x = 6.61 × 4.19
  4. Step 4: Simplify right side
    4.79x = 27.70
  5. Step 5: Solve for x
    x = 27.70/4.79
  6. Step 6: Final answer
    x = 5.78

Related Problems

Find fourth proportional to 2.40, 3.31 and 2.10
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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.