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Finding the Fourth Proportional to 510.78, 764.49 and 388.37

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Solution

The fourth proportional to 510.78, 764.49 and 388.37 is: 581.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.78 : 764.49 = 388.37 : x
  2. Step 2: Convert to fraction form
    510.78/764.49 = 388.37/x
  3. Step 3: Cross multiply
    510.78x = 764.49 × 388.37
  4. Step 4: Simplify right side
    510.78x = 296,901.16
  5. Step 5: Solve for x
    x = 296,901.16/510.78
  6. Step 6: Final answer
    x = 581.27

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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.