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Finding the Fourth Proportional to 512.13, 767.77 and 438.72

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Solution

The fourth proportional to 512.13, 767.77 and 438.72 is: 657.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.13 : 767.77 = 438.72 : x
  2. Step 2: Convert to fraction form
    512.13/767.77 = 438.72/x
  3. Step 3: Cross multiply
    512.13x = 767.77 × 438.72
  4. Step 4: Simplify right side
    512.13x = 336,836.05
  5. Step 5: Solve for x
    x = 336,836.05/512.13
  6. Step 6: Final answer
    x = 657.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.