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Finding the Fourth Proportional to 1,069.89, 1,606.20 and 720.74

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Solution

The fourth proportional to 1,069.89, 1,606.20 and 720.74 is: 1,082.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.89 : 1,606.20 = 720.74 : x
  2. Step 2: Convert to fraction form
    1,069.89/1,606.20 = 720.74/x
  3. Step 3: Cross multiply
    1,069.89x = 1,606.20 × 720.74
  4. Step 4: Simplify right side
    1,069.89x = 1,157,644.56
  5. Step 5: Solve for x
    x = 1,157,644.56/1,069.89
  6. Step 6: Final answer
    x = 1,082.02

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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.