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Finding the Fourth Proportional to 2,815.16, 4,222.36 and 867.20

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Solution

The fourth proportional to 2,815.16, 4,222.36 and 867.20 is: 1,300.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.16 : 4,222.36 = 867.20 : x
  2. Step 2: Convert to fraction form
    2,815.16/4,222.36 = 867.20/x
  3. Step 3: Cross multiply
    2,815.16x = 4,222.36 × 867.20
  4. Step 4: Simplify right side
    2,815.16x = 3,661,630.59
  5. Step 5: Solve for x
    x = 3,661,630.59/2,815.16
  6. Step 6: Final answer
    x = 1,300.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.