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Finding the Fourth Proportional to 891.62, 1,230.16 and 518.53

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Solution

The fourth proportional to 891.62, 1,230.16 and 518.53 is: 715.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.62 : 1,230.16 = 518.53 : x
  2. Step 2: Convert to fraction form
    891.62/1,230.16 = 518.53/x
  3. Step 3: Cross multiply
    891.62x = 1,230.16 × 518.53
  4. Step 4: Simplify right side
    891.62x = 637,874.86
  5. Step 5: Solve for x
    x = 637,874.86/891.62
  6. Step 6: Final answer
    x = 715.41

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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.