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Finding the Fourth Proportional to 439.55, 607.38 and 418.19

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Solution

The fourth proportional to 439.55, 607.38 and 418.19 is: 577.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.55 : 607.38 = 418.19 : x
  2. Step 2: Convert to fraction form
    439.55/607.38 = 418.19/x
  3. Step 3: Cross multiply
    439.55x = 607.38 × 418.19
  4. Step 4: Simplify right side
    439.55x = 254,001.76
  5. Step 5: Solve for x
    x = 254,001.76/439.55
  6. Step 6: Final answer
    x = 577.86

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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.