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Finding the Fourth Proportional to 728.79, 1,091.81 and 565.67

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Solution

The fourth proportional to 728.79, 1,091.81 and 565.67 is: 847.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.79 : 1,091.81 = 565.67 : x
  2. Step 2: Convert to fraction form
    728.79/1,091.81 = 565.67/x
  3. Step 3: Cross multiply
    728.79x = 1,091.81 × 565.67
  4. Step 4: Simplify right side
    728.79x = 617,604.16
  5. Step 5: Solve for x
    x = 617,604.16/728.79
  6. Step 6: Final answer
    x = 847.44

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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.