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Finding the Fourth Proportional to 819.19, 1,130.42 and 520.41

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Solution

The fourth proportional to 819.19, 1,130.42 and 520.41 is: 718.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.19 : 1,130.42 = 520.41 : x
  2. Step 2: Convert to fraction form
    819.19/1,130.42 = 520.41/x
  3. Step 3: Cross multiply
    819.19x = 1,130.42 × 520.41
  4. Step 4: Simplify right side
    819.19x = 588,281.87
  5. Step 5: Solve for x
    x = 588,281.87/819.19
  6. Step 6: Final answer
    x = 718.13

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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.