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Finding the Fourth Proportional to 1,069.96, 1,604.90 and 421.16

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Solution

The fourth proportional to 1,069.96, 1,604.90 and 421.16 is: 631.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.96 : 1,604.90 = 421.16 : x
  2. Step 2: Convert to fraction form
    1,069.96/1,604.90 = 421.16/x
  3. Step 3: Cross multiply
    1,069.96x = 1,604.90 × 421.16
  4. Step 4: Simplify right side
    1,069.96x = 675,919.68
  5. Step 5: Solve for x
    x = 675,919.68/1,069.96
  6. Step 6: Final answer
    x = 631.72

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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.