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Finding the Fourth Proportional to 19.19, 28.78 and 7.01

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Solution

The fourth proportional to 19.19, 28.78 and 7.01 is: 10.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.19 : 28.78 = 7.01 : x
  2. Step 2: Convert to fraction form
    19.19/28.78 = 7.01/x
  3. Step 3: Cross multiply
    19.19x = 28.78 × 7.01
  4. Step 4: Simplify right side
    19.19x = 201.57
  5. Step 5: Solve for x
    x = 201.57/19.19
  6. Step 6: Final answer
    x = 10.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.