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Finding the Fourth Proportional to 391,496.40, 587,244.60 and 328,510.80

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Solution

The fourth proportional to 391,496.40, 587,244.60 and 328,510.80 is: 492,766.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,496.40 : 587,244.60 = 328,510.80 : x
  2. Step 2: Convert to fraction form
    391,496.40/587,244.60 = 328,510.80/x
  3. Step 3: Cross multiply
    391,496.40x = 587,244.60 × 328,510.80
  4. Step 4: Simplify right side
    391,496.40x = 192,916,193,341.68
  5. Step 5: Solve for x
    x = 192,916,193,341.68/391,496.40
  6. Step 6: Final answer
    x = 492,766.20

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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.