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Finding the Fourth Proportional to 2,132.64, 3,197.45 and 815.28

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Solution

The fourth proportional to 2,132.64, 3,197.45 and 815.28 is: 1,222.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,132.64 : 3,197.45 = 815.28 : x
  2. Step 2: Convert to fraction form
    2,132.64/3,197.45 = 815.28/x
  3. Step 3: Cross multiply
    2,132.64x = 3,197.45 × 815.28
  4. Step 4: Simplify right side
    2,132.64x = 2,606,827.80
  5. Step 5: Solve for x
    x = 2,606,827.80/2,132.64
  6. Step 6: Final answer
    x = 1,222.35

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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.