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Finding the Fourth Proportional to 658,399.40, 987,007.80 and 259,312.40

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Solution

The fourth proportional to 658,399.40, 987,007.80 and 259,312.40 is: 388,735.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,399.40 : 987,007.80 = 259,312.40 : x
  2. Step 2: Convert to fraction form
    658,399.40/987,007.80 = 259,312.40/x
  3. Step 3: Cross multiply
    658,399.40x = 987,007.80 × 259,312.40
  4. Step 4: Simplify right side
    658,399.40x = 255,943,361,436.72
  5. Step 5: Solve for x
    x = 255,943,361,436.72/658,399.40
  6. Step 6: Final answer
    x = 388,735.71

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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.