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Finding the Fourth Proportional to 206,721.20, 310,081.80 and 127,924.40

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Solution

The fourth proportional to 206,721.20, 310,081.80 and 127,924.40 is: 191,886.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,721.20 : 310,081.80 = 127,924.40 : x
  2. Step 2: Convert to fraction form
    206,721.20/310,081.80 = 127,924.40/x
  3. Step 3: Cross multiply
    206,721.20x = 310,081.80 × 127,924.40
  4. Step 4: Simplify right side
    206,721.20x = 39,667,028,215.92
  5. Step 5: Solve for x
    x = 39,667,028,215.92/206,721.20
  6. Step 6: Final answer
    x = 191,886.60

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1.5x scale

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.