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Finding the Fourth Proportional to 440.06, 606.57 and 390.86

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Solution

The fourth proportional to 440.06, 606.57 and 390.86 is: 538.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.06 : 606.57 = 390.86 : x
  2. Step 2: Convert to fraction form
    440.06/606.57 = 390.86/x
  3. Step 3: Cross multiply
    440.06x = 606.57 × 390.86
  4. Step 4: Simplify right side
    440.06x = 237,083.95
  5. Step 5: Solve for x
    x = 237,083.95/440.06
  6. Step 6: Final answer
    x = 538.75

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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.