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Finding the Fourth Proportional to 2,900.74, 4,351.34 and 820.71

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Solution

The fourth proportional to 2,900.74, 4,351.34 and 820.71 is: 1,231.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,900.74 : 4,351.34 = 820.71 : x
  2. Step 2: Convert to fraction form
    2,900.74/4,351.34 = 820.71/x
  3. Step 3: Cross multiply
    2,900.74x = 4,351.34 × 820.71
  4. Step 4: Simplify right side
    2,900.74x = 3,571,175.99
  5. Step 5: Solve for x
    x = 3,571,175.99/2,900.74
  6. Step 6: Final answer
    x = 1,231.13

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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.