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Finding the Fourth Proportional to 7,815.79, 10,786.07 and 4,279

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Solution

The fourth proportional to 7,815.79, 10,786.07 and 4,279 is: 5,905.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.79 : 10,786.07 = 4,279 : x
  2. Step 2: Convert to fraction form
    7,815.79/10,786.07 = 4,279/x
  3. Step 3: Cross multiply
    7,815.79x = 10,786.07 × 4,279
  4. Step 4: Simplify right side
    7,815.79x = 46,153,593.53
  5. Step 5: Solve for x
    x = 46,153,593.53/7,815.79
  6. Step 6: Final answer
    x = 5,905.17

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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.