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Finding the Fourth Proportional to 440.07, 606.96 and 390.33

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Solution

The fourth proportional to 440.07, 606.96 and 390.33 is: 538.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.07 : 606.96 = 390.33 : x
  2. Step 2: Convert to fraction form
    440.07/606.96 = 390.33/x
  3. Step 3: Cross multiply
    440.07x = 606.96 × 390.33
  4. Step 4: Simplify right side
    440.07x = 236,914.70
  5. Step 5: Solve for x
    x = 236,914.70/440.07
  6. Step 6: Final answer
    x = 538.36

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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.