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Finding the Fourth Proportional to 1.72, 2.58 and 1.05

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Solution

The fourth proportional to 1.72, 2.58 and 1.05 is: 1.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.72 : 2.58 = 1.05 : x
  2. Step 2: Convert to fraction form
    1.72/2.58 = 1.05/x
  3. Step 3: Cross multiply
    1.72x = 2.58 × 1.05
  4. Step 4: Simplify right side
    1.72x = 2.73
  5. Step 5: Solve for x
    x = 2.73/1.72
  6. Step 6: Final answer
    x = 1.58

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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.