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Finding the Fourth Proportional to 326,612.70, 489,919.05 and 139,643.10

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Solution

The fourth proportional to 326,612.70, 489,919.05 and 139,643.10 is: 209,464.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,612.70 : 489,919.05 = 139,643.10 : x
  2. Step 2: Convert to fraction form
    326,612.70/489,919.05 = 139,643.10/x
  3. Step 3: Cross multiply
    326,612.70x = 489,919.05 × 139,643.10
  4. Step 4: Simplify right side
    326,612.70x = 68,413,814,891.06
  5. Step 5: Solve for x
    x = 68,413,814,891.06/326,612.70
  6. Step 6: Final answer
    x = 209,464.65

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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.