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Finding the Fourth Proportional to 1.72, 2.57 and 1.56

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Solution

The fourth proportional to 1.72, 2.57 and 1.56 is: 2.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.72 : 2.57 = 1.56 : x
  2. Step 2: Convert to fraction form
    1.72/2.57 = 1.56/x
  3. Step 3: Cross multiply
    1.72x = 2.57 × 1.56
  4. Step 4: Simplify right side
    1.72x = 4.01
  5. Step 5: Solve for x
    x = 4.01/1.72
  6. Step 6: Final answer
    x = 2.34

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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.