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Finding the Fourth Proportional to 2,815.16, 4,222.74 and 763.32

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Solution

The fourth proportional to 2,815.16, 4,222.74 and 763.32 is: 1,144.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.16 : 4,222.74 = 763.32 : x
  2. Step 2: Convert to fraction form
    2,815.16/4,222.74 = 763.32/x
  3. Step 3: Cross multiply
    2,815.16x = 4,222.74 × 763.32
  4. Step 4: Simplify right side
    2,815.16x = 3,223,301.90
  5. Step 5: Solve for x
    x = 3,223,301.90/2,815.16
  6. Step 6: Final answer
    x = 1,144.98

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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.