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Finding the Fourth Proportional to 1,069.45, 1,604.21 and 420.19

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Solution

The fourth proportional to 1,069.45, 1,604.21 and 420.19 is: 630.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.45 : 1,604.21 = 420.19 : x
  2. Step 2: Convert to fraction form
    1,069.45/1,604.21 = 420.19/x
  3. Step 3: Cross multiply
    1,069.45x = 1,604.21 × 420.19
  4. Step 4: Simplify right side
    1,069.45x = 674,066.89
  5. Step 5: Solve for x
    x = 674,066.89/1,069.45
  6. Step 6: Final answer
    x = 630.29

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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.