Home / 5,115.72-7,678.44-4,211.76

Finding the Fourth Proportional to 5,115.72, 7,678.44 and 4,211.76

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Solution

The fourth proportional to 5,115.72, 7,678.44 and 4,211.76 is: 6,321.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.72 : 7,678.44 = 4,211.76 : x
  2. Step 2: Convert to fraction form
    5,115.72/7,678.44 = 4,211.76/x
  3. Step 3: Cross multiply
    5,115.72x = 7,678.44 × 4,211.76
  4. Step 4: Simplify right side
    5,115.72x = 32,339,746.45
  5. Step 5: Solve for x
    x = 32,339,746.45/5,115.72
  6. Step 6: Final answer
    x = 6,321.64

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1.5x scale

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.