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Finding the Fourth Proportional to 19.02, 26.28 and 15.78

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Solution

The fourth proportional to 19.02, 26.28 and 15.78 is: 21.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.02 : 26.28 = 15.78 : x
  2. Step 2: Convert to fraction form
    19.02/26.28 = 15.78/x
  3. Step 3: Cross multiply
    19.02x = 26.28 × 15.78
  4. Step 4: Simplify right side
    19.02x = 414.70
  5. Step 5: Solve for x
    x = 414.70/19.02
  6. Step 6: Final answer
    x = 21.80

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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.