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Finding the Fourth Proportional to 7,930.91, 10,964.16 and 7,856.19

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Solution

The fourth proportional to 7,930.91, 10,964.16 and 7,856.19 is: 10,860.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,930.91 : 10,964.16 = 7,856.19 : x
  2. Step 2: Convert to fraction form
    7,930.91/10,964.16 = 7,856.19/x
  3. Step 3: Cross multiply
    7,930.91x = 10,964.16 × 7,856.19
  4. Step 4: Simplify right side
    7,930.91x = 86,136,524.15
  5. Step 5: Solve for x
    x = 86,136,524.15/7,930.91
  6. Step 6: Final answer
    x = 10,860.86

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1.5x scale

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.