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Finding the Fourth Proportional to 1,069.56, 1,604.06 and 420.30

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Solution

The fourth proportional to 1,069.56, 1,604.06 and 420.30 is: 630.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.56 : 1,604.06 = 420.30 : x
  2. Step 2: Convert to fraction form
    1,069.56/1,604.06 = 420.30/x
  3. Step 3: Cross multiply
    1,069.56x = 1,604.06 × 420.30
  4. Step 4: Simplify right side
    1,069.56x = 674,186.42
  5. Step 5: Solve for x
    x = 674,186.42/1,069.56
  6. Step 6: Final answer
    x = 630.34

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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.