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Finding the Fourth Proportional to 3.15, 4.72 and 1.86

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Solution

The fourth proportional to 3.15, 4.72 and 1.86 is: 2.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.15 : 4.72 = 1.86 : x
  2. Step 2: Convert to fraction form
    3.15/4.72 = 1.86/x
  3. Step 3: Cross multiply
    3.15x = 4.72 × 1.86
  4. Step 4: Simplify right side
    3.15x = 8.77
  5. Step 5: Solve for x
    x = 8.77/3.15
  6. Step 6: Final answer
    x = 2.79

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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.