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Finding the Fourth Proportional to 391,628.80, 587,637.60 and 154,979.20

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Solution

The fourth proportional to 391,628.80, 587,637.60 and 154,979.20 is: 232,545.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,628.80 : 587,637.60 = 154,979.20 : x
  2. Step 2: Convert to fraction form
    391,628.80/587,637.60 = 154,979.20/x
  3. Step 3: Cross multiply
    391,628.80x = 587,637.60 × 154,979.20
  4. Step 4: Simplify right side
    391,628.80x = 91,071,605,137.92
  5. Step 5: Solve for x
    x = 91,071,605,137.92/391,628.80
  6. Step 6: Final answer
    x = 232,545.73

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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.