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Finding the Fourth Proportional to 2,151.34, 3,226.47 and 689.74

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Solution

The fourth proportional to 2,151.34, 3,226.47 and 689.74 is: 1,034.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.34 : 3,226.47 = 689.74 : x
  2. Step 2: Convert to fraction form
    2,151.34/3,226.47 = 689.74/x
  3. Step 3: Cross multiply
    2,151.34x = 3,226.47 × 689.74
  4. Step 4: Simplify right side
    2,151.34x = 2,225,425.42
  5. Step 5: Solve for x
    x = 2,225,425.42/2,151.34
  6. Step 6: Final answer
    x = 1,034.44

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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.