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Finding the Fourth Proportional to 439.34, 659.10 and 436.28

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Solution

The fourth proportional to 439.34, 659.10 and 436.28 is: 654.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.34 : 659.10 = 436.28 : x
  2. Step 2: Convert to fraction form
    439.34/659.10 = 436.28/x
  3. Step 3: Cross multiply
    439.34x = 659.10 × 436.28
  4. Step 4: Simplify right side
    439.34x = 287,552.15
  5. Step 5: Solve for x
    x = 287,552.15/439.34
  6. Step 6: Final answer
    x = 654.51

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.