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Finding the Fourth Proportional to 439.16, 654.48 and 438.48

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Solution

The fourth proportional to 439.16, 654.48 and 438.48 is: 653.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.16 : 654.48 = 438.48 : x
  2. Step 2: Convert to fraction form
    439.16/654.48 = 438.48/x
  3. Step 3: Cross multiply
    439.16x = 654.48 × 438.48
  4. Step 4: Simplify right side
    439.16x = 286,976.39
  5. Step 5: Solve for x
    x = 286,976.39/439.16
  6. Step 6: Final answer
    x = 653.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.