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Finding the Fourth Proportional to 439.44, 656.04 and 390.84

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Solution

The fourth proportional to 439.44, 656.04 and 390.84 is: 583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.44 : 656.04 = 390.84 : x
  2. Step 2: Convert to fraction form
    439.44/656.04 = 390.84/x
  3. Step 3: Cross multiply
    439.44x = 656.04 × 390.84
  4. Step 4: Simplify right side
    439.44x = 256,406.67
  5. Step 5: Solve for x
    x = 256,406.67/439.44
  6. Step 6: Final answer
    x = 583.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.