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Finding the Fourth Proportional to 890.49, 1,228.91 and 517.61

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Solution

The fourth proportional to 890.49, 1,228.91 and 517.61 is: 714.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.49 : 1,228.91 = 517.61 : x
  2. Step 2: Convert to fraction form
    890.49/1,228.91 = 517.61/x
  3. Step 3: Cross multiply
    890.49x = 1,228.91 × 517.61
  4. Step 4: Simplify right side
    890.49x = 636,087.37
  5. Step 5: Solve for x
    x = 636,087.37/890.49
  6. Step 6: Final answer
    x = 714.31

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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.