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Finding the Fourth Proportional to 7,815.78, 10,785.78 and 4,279.20

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Solution

The fourth proportional to 7,815.78, 10,785.78 and 4,279.20 is: 5,905.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.78 : 10,785.78 = 4,279.20 : x
  2. Step 2: Convert to fraction form
    7,815.78/10,785.78 = 4,279.20/x
  3. Step 3: Cross multiply
    7,815.78x = 10,785.78 × 4,279.20
  4. Step 4: Simplify right side
    7,815.78x = 46,154,509.78
  5. Step 5: Solve for x
    x = 46,154,509.78/7,815.78
  6. Step 6: Final answer
    x = 5,905.30

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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.