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Finding the Fourth Proportional to 17.40, 24 and 15.78

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Solution

The fourth proportional to 17.40, 24 and 15.78 is: 21.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.40 : 24 = 15.78 : x
  2. Step 2: Convert to fraction form
    17.40/24 = 15.78/x
  3. Step 3: Cross multiply
    17.40x = 24 × 15.78
  4. Step 4: Simplify right side
    17.40x = 378.72
  5. Step 5: Solve for x
    x = 378.72/17.40
  6. Step 6: Final answer
    x = 21.77

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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.