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Finding the Fourth Proportional to 7,815.15, 10,785.15 and 4,278.69

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Solution

The fourth proportional to 7,815.15, 10,785.15 and 4,278.69 is: 5,904.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.15 : 10,785.15 = 4,278.69 : x
  2. Step 2: Convert to fraction form
    7,815.15/10,785.15 = 4,278.69/x
  3. Step 3: Cross multiply
    7,815.15x = 10,785.15 × 4,278.69
  4. Step 4: Simplify right side
    7,815.15x = 46,146,313.45
  5. Step 5: Solve for x
    x = 46,146,313.45/7,815.15
  6. Step 6: Final answer
    x = 5,904.73

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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.