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Finding the Fourth Proportional to 19.93, 27.50 and 12.65

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Solution

The fourth proportional to 19.93, 27.50 and 12.65 is: 17.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.93 : 27.50 = 12.65 : x
  2. Step 2: Convert to fraction form
    19.93/27.50 = 12.65/x
  3. Step 3: Cross multiply
    19.93x = 27.50 × 12.65
  4. Step 4: Simplify right side
    19.93x = 347.78
  5. Step 5: Solve for x
    x = 347.78/19.93
  6. Step 6: Final answer
    x = 17.45

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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.