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Finding the Fourth Proportional to 680.87, 1,018.17 and 505.51

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Solution

The fourth proportional to 680.87, 1,018.17 and 505.51 is: 755.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.87 : 1,018.17 = 505.51 : x
  2. Step 2: Convert to fraction form
    680.87/1,018.17 = 505.51/x
  3. Step 3: Cross multiply
    680.87x = 1,018.17 × 505.51
  4. Step 4: Simplify right side
    680.87x = 514,692.57
  5. Step 5: Solve for x
    x = 514,692.57/680.87
  6. Step 6: Final answer
    x = 755.93

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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.