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Finding the Fourth Proportional to 828.89, 1,143.40 and 517.85

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Solution

The fourth proportional to 828.89, 1,143.40 and 517.85 is: 714.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.89 : 1,143.40 = 517.85 : x
  2. Step 2: Convert to fraction form
    828.89/1,143.40 = 517.85/x
  3. Step 3: Cross multiply
    828.89x = 1,143.40 × 517.85
  4. Step 4: Simplify right side
    828.89x = 592,108.97
  5. Step 5: Solve for x
    x = 592,108.97/828.89
  6. Step 6: Final answer
    x = 714.34

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Double scale
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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.