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Finding the Fourth Proportional to 326,523.80, 489,785.70 and 139,899.80

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Solution

The fourth proportional to 326,523.80, 489,785.70 and 139,899.80 is: 209,849.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,523.80 : 489,785.70 = 139,899.80 : x
  2. Step 2: Convert to fraction form
    326,523.80/489,785.70 = 139,899.80/x
  3. Step 3: Cross multiply
    326,523.80x = 489,785.70 × 139,899.80
  4. Step 4: Simplify right side
    326,523.80x = 68,520,921,472.86
  5. Step 5: Solve for x
    x = 68,520,921,472.86/326,523.80
  6. Step 6: Final answer
    x = 209,849.70

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Similar ratio
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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.