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Finding the Fourth Proportional to 2,421.68, 3,631.74 and 689.84

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Solution

The fourth proportional to 2,421.68, 3,631.74 and 689.84 is: 1,034.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,421.68 : 3,631.74 = 689.84 : x
  2. Step 2: Convert to fraction form
    2,421.68/3,631.74 = 689.84/x
  3. Step 3: Cross multiply
    2,421.68x = 3,631.74 × 689.84
  4. Step 4: Simplify right side
    2,421.68x = 2,505,319.52
  5. Step 5: Solve for x
    x = 2,505,319.52/2,421.68
  6. Step 6: Final answer
    x = 1,034.54

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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.