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Finding the Fourth Proportional to 890.45, 1,229.05 and 517.38

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Solution

The fourth proportional to 890.45, 1,229.05 and 517.38 is: 714.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.45 : 1,229.05 = 517.38 : x
  2. Step 2: Convert to fraction form
    890.45/1,229.05 = 517.38/x
  3. Step 3: Cross multiply
    890.45x = 1,229.05 × 517.38
  4. Step 4: Simplify right side
    890.45x = 635,883.93
  5. Step 5: Solve for x
    x = 635,883.93/890.45
  6. Step 6: Final answer
    x = 714.12

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Double scale
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1.5x scale

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.