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Finding the Fourth Proportional to 7,815.80, 10,785.80 and 4,279.01

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Solution

The fourth proportional to 7,815.80, 10,785.80 and 4,279.01 is: 5,905.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.80 : 10,785.80 = 4,279.01 : x
  2. Step 2: Convert to fraction form
    7,815.80/10,785.80 = 4,279.01/x
  3. Step 3: Cross multiply
    7,815.80x = 10,785.80 × 4,279.01
  4. Step 4: Simplify right side
    7,815.80x = 46,152,583.72
  5. Step 5: Solve for x
    x = 46,152,583.72/7,815.80
  6. Step 6: Final answer
    x = 5,905.03

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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.