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Finding the Fourth Proportional to 741.45, 1,109.61 and 609.87

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Solution

The fourth proportional to 741.45, 1,109.61 and 609.87 is: 912.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.45 : 1,109.61 = 609.87 : x
  2. Step 2: Convert to fraction form
    741.45/1,109.61 = 609.87/x
  3. Step 3: Cross multiply
    741.45x = 1,109.61 × 609.87
  4. Step 4: Simplify right side
    741.45x = 676,717.85
  5. Step 5: Solve for x
    x = 676,717.85/741.45
  6. Step 6: Final answer
    x = 912.70

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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.