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Finding the Fourth Proportional to 2,570.15, 3,855.24 and 815.12

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Solution

The fourth proportional to 2,570.15, 3,855.24 and 815.12 is: 1,222.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,570.15 : 3,855.24 = 815.12 : x
  2. Step 2: Convert to fraction form
    2,570.15/3,855.24 = 815.12/x
  3. Step 3: Cross multiply
    2,570.15x = 3,855.24 × 815.12
  4. Step 4: Simplify right side
    2,570.15x = 3,142,483.23
  5. Step 5: Solve for x
    x = 3,142,483.23/2,570.15
  6. Step 6: Final answer
    x = 1,222.68

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Similar ratio
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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.