Home / 287,979.35-431,939.85-77,638.55

Finding the Fourth Proportional to 287,979.35, 431,939.85 and 77,638.55

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Solution

The fourth proportional to 287,979.35, 431,939.85 and 77,638.55 is: 116,449.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,979.35 : 431,939.85 = 77,638.55 : x
  2. Step 2: Convert to fraction form
    287,979.35/431,939.85 = 77,638.55/x
  3. Step 3: Cross multiply
    287,979.35x = 431,939.85 × 77,638.55
  4. Step 4: Simplify right side
    287,979.35x = 33,535,181,481.52
  5. Step 5: Solve for x
    x = 33,535,181,481.52/287,979.35
  6. Step 6: Final answer
    x = 116,449.95

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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.