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Finding the Fourth Proportional to 800.71, 1,105.22 and 520.45

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Solution

The fourth proportional to 800.71, 1,105.22 and 520.45 is: 718.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.71 : 1,105.22 = 520.45 : x
  2. Step 2: Convert to fraction form
    800.71/1,105.22 = 520.45/x
  3. Step 3: Cross multiply
    800.71x = 1,105.22 × 520.45
  4. Step 4: Simplify right side
    800.71x = 575,210.29
  5. Step 5: Solve for x
    x = 575,210.29/800.71
  6. Step 6: Final answer
    x = 718.38

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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.