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Finding the Fourth Proportional to 890.93, 1,229.38 and 517.86

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Solution

The fourth proportional to 890.93, 1,229.38 and 517.86 is: 714.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.93 : 1,229.38 = 517.86 : x
  2. Step 2: Convert to fraction form
    890.93/1,229.38 = 517.86/x
  3. Step 3: Cross multiply
    890.93x = 1,229.38 × 517.86
  4. Step 4: Simplify right side
    890.93x = 636,645.43
  5. Step 5: Solve for x
    x = 636,645.43/890.93
  6. Step 6: Final answer
    x = 714.58

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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.