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Finding the Fourth Proportional to 12.72, 19.08 and 4.70

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Solution

The fourth proportional to 12.72, 19.08 and 4.70 is: 7.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.72 : 19.08 = 4.70 : x
  2. Step 2: Convert to fraction form
    12.72/19.08 = 4.70/x
  3. Step 3: Cross multiply
    12.72x = 19.08 × 4.70
  4. Step 4: Simplify right side
    12.72x = 89.68
  5. Step 5: Solve for x
    x = 89.68/12.72
  6. Step 6: Final answer
    x = 7.05

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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.