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Finding the Fourth Proportional to 2,815.60, 4,223.40 and 867.55

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Solution

The fourth proportional to 2,815.60, 4,223.40 and 867.55 is: 1,301.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.60 : 4,223.40 = 867.55 : x
  2. Step 2: Convert to fraction form
    2,815.60/4,223.40 = 867.55/x
  3. Step 3: Cross multiply
    2,815.60x = 4,223.40 × 867.55
  4. Step 4: Simplify right side
    2,815.60x = 3,664,010.67
  5. Step 5: Solve for x
    x = 3,664,010.67/2,815.60
  6. Step 6: Final answer
    x = 1,301.33

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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.