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Finding the Fourth Proportional to 2,815.10, 4,222.65 and 867.30

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Solution

The fourth proportional to 2,815.10, 4,222.65 and 867.30 is: 1,300.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.10 : 4,222.65 = 867.30 : x
  2. Step 2: Convert to fraction form
    2,815.10/4,222.65 = 867.30/x
  3. Step 3: Cross multiply
    2,815.10x = 4,222.65 × 867.30
  4. Step 4: Simplify right side
    2,815.10x = 3,662,304.35
  5. Step 5: Solve for x
    x = 3,662,304.35/2,815.10
  6. Step 6: Final answer
    x = 1,300.95

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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.