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Finding the Fourth Proportional to 511.78, 706.29 and 438.07

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Solution

The fourth proportional to 511.78, 706.29 and 438.07 is: 604.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.78 : 706.29 = 438.07 : x
  2. Step 2: Convert to fraction form
    511.78/706.29 = 438.07/x
  3. Step 3: Cross multiply
    511.78x = 706.29 × 438.07
  4. Step 4: Simplify right side
    511.78x = 309,404.46
  5. Step 5: Solve for x
    x = 309,404.46/511.78
  6. Step 6: Final answer
    x = 604.57

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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.