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Finding the Fourth Proportional to 386,479.40, 579,690.30 and 161,781.80

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Solution

The fourth proportional to 386,479.40, 579,690.30 and 161,781.80 is: 242,660.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,479.40 : 579,690.30 = 161,781.80 : x
  2. Step 2: Convert to fraction form
    386,479.40/579,690.30 = 161,781.80/x
  3. Step 3: Cross multiply
    386,479.40x = 579,690.30 × 161,781.80
  4. Step 4: Simplify right side
    386,479.40x = 93,783,340,176.54
  5. Step 5: Solve for x
    x = 93,783,340,176.54/386,479.40
  6. Step 6: Final answer
    x = 242,660.64

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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.