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Finding the Fourth Proportional to 439.19, 606.09 and 284.21

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Solution

The fourth proportional to 439.19, 606.09 and 284.21 is: 392.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.19 : 606.09 = 284.21 : x
  2. Step 2: Convert to fraction form
    439.19/606.09 = 284.21/x
  3. Step 3: Cross multiply
    439.19x = 606.09 × 284.21
  4. Step 4: Simplify right side
    439.19x = 172,256.84
  5. Step 5: Solve for x
    x = 172,256.84/439.19
  6. Step 6: Final answer
    x = 392.21

Related Problems

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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.