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Finding the Fourth Proportional to 2.07, 2.85 and 1.35

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Solution

The fourth proportional to 2.07, 2.85 and 1.35 is: 1.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.07 : 2.85 = 1.35 : x
  2. Step 2: Convert to fraction form
    2.07/2.85 = 1.35/x
  3. Step 3: Cross multiply
    2.07x = 2.85 × 1.35
  4. Step 4: Simplify right side
    2.07x = 3.83
  5. Step 5: Solve for x
    x = 3.83/2.07
  6. Step 6: Final answer
    x = 1.85

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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.