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Finding the Fourth Proportional to 1.78, 2.66 and 1.55

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Solution

The fourth proportional to 1.78, 2.66 and 1.55 is: 2.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.78 : 2.66 = 1.55 : x
  2. Step 2: Convert to fraction form
    1.78/2.66 = 1.55/x
  3. Step 3: Cross multiply
    1.78x = 2.66 × 1.55
  4. Step 4: Simplify right side
    1.78x = 4.11
  5. Step 5: Solve for x
    x = 4.11/1.78
  6. Step 6: Final answer
    x = 2.31

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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.