Home / 258,931.38-388,418.13-71,942.88

Finding the Fourth Proportional to 258,931.38, 388,418.13 and 71,942.88

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Solution

The fourth proportional to 258,931.38, 388,418.13 and 71,942.88 is: 107,920.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,931.38 : 388,418.13 = 71,942.88 : x
  2. Step 2: Convert to fraction form
    258,931.38/388,418.13 = 71,942.88/x
  3. Step 3: Cross multiply
    258,931.38x = 388,418.13 × 71,942.88
  4. Step 4: Simplify right side
    258,931.38x = 27,943,918,916.41
  5. Step 5: Solve for x
    x = 27,943,918,916.41/258,931.38
  6. Step 6: Final answer
    x = 107,920.17

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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.