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Finding the Fourth Proportional to 2,570.65, 3,856.08 and 815.61

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Solution

The fourth proportional to 2,570.65, 3,856.08 and 815.61 is: 1,223.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,570.65 : 3,856.08 = 815.61 : x
  2. Step 2: Convert to fraction form
    2,570.65/3,856.08 = 815.61/x
  3. Step 3: Cross multiply
    2,570.65x = 3,856.08 × 815.61
  4. Step 4: Simplify right side
    2,570.65x = 3,145,057.41
  5. Step 5: Solve for x
    x = 3,145,057.41/2,570.65
  6. Step 6: Final answer
    x = 1,223.45

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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.