Home / 258,897.40-388,399.05-109,137.71

Finding the Fourth Proportional to 258,897.40, 388,399.05 and 109,137.71

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Solution

The fourth proportional to 258,897.40, 388,399.05 and 109,137.71 is: 163,728.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,897.40 : 388,399.05 = 109,137.71 : x
  2. Step 2: Convert to fraction form
    258,897.40/388,399.05 = 109,137.71/x
  3. Step 3: Cross multiply
    258,897.40x = 388,399.05 × 109,137.71
  4. Step 4: Simplify right side
    258,897.40x = 42,388,983,854.17
  5. Step 5: Solve for x
    x = 42,388,983,854.17/258,897.40
  6. Step 6: Final answer
    x = 163,728.89

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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.