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Finding the Fourth Proportional to 800.79, 1,105.58 and 517.69

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Solution

The fourth proportional to 800.79, 1,105.58 and 517.69 is: 714.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.79 : 1,105.58 = 517.69 : x
  2. Step 2: Convert to fraction form
    800.79/1,105.58 = 517.69/x
  3. Step 3: Cross multiply
    800.79x = 1,105.58 × 517.69
  4. Step 4: Simplify right side
    800.79x = 572,350.39
  5. Step 5: Solve for x
    x = 572,350.39/800.79
  6. Step 6: Final answer
    x = 714.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.