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Finding the Fourth Proportional to 7,815.84, 10,785.78 and 4,278.84

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Solution

The fourth proportional to 7,815.84, 10,785.78 and 4,278.84 is: 5,904.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.84 : 10,785.78 = 4,278.84 : x
  2. Step 2: Convert to fraction form
    7,815.84/10,785.78 = 4,278.84/x
  3. Step 3: Cross multiply
    7,815.84x = 10,785.78 × 4,278.84
  4. Step 4: Simplify right side
    7,815.84x = 46,150,626.90
  5. Step 5: Solve for x
    x = 46,150,626.90/7,815.84
  6. Step 6: Final answer
    x = 5,904.76

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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.