Home / 259,335.91-388,990.09-79,421.28

Finding the Fourth Proportional to 259,335.91, 388,990.09 and 79,421.28

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Solution

The fourth proportional to 259,335.91, 388,990.09 and 79,421.28 is: 119,127.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,335.91 : 388,990.09 = 79,421.28 : x
  2. Step 2: Convert to fraction form
    259,335.91/388,990.09 = 79,421.28/x
  3. Step 3: Cross multiply
    259,335.91x = 388,990.09 × 79,421.28
  4. Step 4: Simplify right side
    259,335.91x = 30,894,090,855.12
  5. Step 5: Solve for x
    x = 30,894,090,855.12/259,335.91
  6. Step 6: Final answer
    x = 119,127.70

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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.