Home / 258,787.45-387,950.31-100,979.20

Finding the Fourth Proportional to 258,787.45, 387,950.31 and 100,979.20

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Solution

The fourth proportional to 258,787.45, 387,950.31 and 100,979.20 is: 151,378.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,787.45 : 387,950.31 = 100,979.20 : x
  2. Step 2: Convert to fraction form
    258,787.45/387,950.31 = 100,979.20/x
  3. Step 3: Cross multiply
    258,787.45x = 387,950.31 × 100,979.20
  4. Step 4: Simplify right side
    258,787.45x = 39,174,911,943.55
  5. Step 5: Solve for x
    x = 39,174,911,943.55/258,787.45
  6. Step 6: Final answer
    x = 151,378.72

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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.