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Finding the Fourth Proportional to 440.22, 606.84 and 390.96

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Solution

The fourth proportional to 440.22, 606.84 and 390.96 is: 538.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.22 : 606.84 = 390.96 : x
  2. Step 2: Convert to fraction form
    440.22/606.84 = 390.96/x
  3. Step 3: Cross multiply
    440.22x = 606.84 × 390.96
  4. Step 4: Simplify right side
    440.22x = 237,250.17
  5. Step 5: Solve for x
    x = 237,250.17/440.22
  6. Step 6: Final answer
    x = 538.94

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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.