Home / 386,999.40-579,186.90-339,760.20

Finding the Fourth Proportional to 386,999.40, 579,186.90 and 339,760.20

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Solution

The fourth proportional to 386,999.40, 579,186.90 and 339,760.20 is: 508,488.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,999.40 : 579,186.90 = 339,760.20 : x
  2. Step 2: Convert to fraction form
    386,999.40/579,186.90 = 339,760.20/x
  3. Step 3: Cross multiply
    386,999.40x = 579,186.90 × 339,760.20
  4. Step 4: Simplify right side
    386,999.40x = 196,784,656,981.38
  5. Step 5: Solve for x
    x = 196,784,656,981.38/386,999.40
  6. Step 6: Final answer
    x = 508,488.27

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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.