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Finding the Fourth Proportional to 369.89, 510.78 and 239.13

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Solution

The fourth proportional to 369.89, 510.78 and 239.13 is: 330.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.89 : 510.78 = 239.13 : x
  2. Step 2: Convert to fraction form
    369.89/510.78 = 239.13/x
  3. Step 3: Cross multiply
    369.89x = 510.78 × 239.13
  4. Step 4: Simplify right side
    369.89x = 122,142.82
  5. Step 5: Solve for x
    x = 122,142.82/369.89
  6. Step 6: Final answer
    x = 330.21

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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.