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Finding the Fourth Proportional to 561.87, 838.58 and 515.43

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Solution

The fourth proportional to 561.87, 838.58 and 515.43 is: 769.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.87 : 838.58 = 515.43 : x
  2. Step 2: Convert to fraction form
    561.87/838.58 = 515.43/x
  3. Step 3: Cross multiply
    561.87x = 838.58 × 515.43
  4. Step 4: Simplify right side
    561.87x = 432,226.71
  5. Step 5: Solve for x
    x = 432,226.71/561.87
  6. Step 6: Final answer
    x = 769.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.