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Finding the Fourth Proportional to 439.97, 607.20 and 253.47

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Solution

The fourth proportional to 439.97, 607.20 and 253.47 is: 349.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.97 : 607.20 = 253.47 : x
  2. Step 2: Convert to fraction form
    439.97/607.20 = 253.47/x
  3. Step 3: Cross multiply
    439.97x = 607.20 × 253.47
  4. Step 4: Simplify right side
    439.97x = 153,903.95
  5. Step 5: Solve for x
    x = 153,903.95/439.97
  6. Step 6: Final answer
    x = 349.81

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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.