Home / 278,623.72-418,006.32-128,971.96

Finding the Fourth Proportional to 278,623.72, 418,006.32 and 128,971.96

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Solution

The fourth proportional to 278,623.72, 418,006.32 and 128,971.96 is: 193,490.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,623.72 : 418,006.32 = 128,971.96 : x
  2. Step 2: Convert to fraction form
    278,623.72/418,006.32 = 128,971.96/x
  3. Step 3: Cross multiply
    278,623.72x = 418,006.32 × 128,971.96
  4. Step 4: Simplify right side
    278,623.72x = 53,911,094,382.79
  5. Step 5: Solve for x
    x = 53,911,094,382.79/278,623.72
  6. Step 6: Final answer
    x = 193,490.68

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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.