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Finding the Fourth Proportional to 326,618.70, 489,928.05 and 139,649.10

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Solution

The fourth proportional to 326,618.70, 489,928.05 and 139,649.10 is: 209,473.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,618.70 : 489,928.05 = 139,649.10 : x
  2. Step 2: Convert to fraction form
    326,618.70/489,928.05 = 139,649.10/x
  3. Step 3: Cross multiply
    326,618.70x = 489,928.05 × 139,649.10
  4. Step 4: Simplify right side
    326,618.70x = 68,418,011,247.26
  5. Step 5: Solve for x
    x = 68,418,011,247.26/326,618.70
  6. Step 6: Final answer
    x = 209,473.65

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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.