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Finding the Fourth Proportional to 555.36, 765.12 and 438.72

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Solution

The fourth proportional to 555.36, 765.12 and 438.72 is: 604.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.36 : 765.12 = 438.72 : x
  2. Step 2: Convert to fraction form
    555.36/765.12 = 438.72/x
  3. Step 3: Cross multiply
    555.36x = 765.12 × 438.72
  4. Step 4: Simplify right side
    555.36x = 335,673.45
  5. Step 5: Solve for x
    x = 335,673.45/555.36
  6. Step 6: Final answer
    x = 604.42

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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.