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Finding the Fourth Proportional to 439.86, 606.13 and 420.98

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Solution

The fourth proportional to 439.86, 606.13 and 420.98 is: 580.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.86 : 606.13 = 420.98 : x
  2. Step 2: Convert to fraction form
    439.86/606.13 = 420.98/x
  3. Step 3: Cross multiply
    439.86x = 606.13 × 420.98
  4. Step 4: Simplify right side
    439.86x = 255,168.61
  5. Step 5: Solve for x
    x = 255,168.61/439.86
  6. Step 6: Final answer
    x = 580.11

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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.