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Finding the Fourth Proportional to 391,518.40, 587,277.60 and 328,532.80

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Solution

The fourth proportional to 391,518.40, 587,277.60 and 328,532.80 is: 492,799.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,518.40 : 587,277.60 = 328,532.80 : x
  2. Step 2: Convert to fraction form
    391,518.40/587,277.60 = 328,532.80/x
  3. Step 3: Cross multiply
    391,518.40x = 587,277.60 × 328,532.80
  4. Step 4: Simplify right side
    391,518.40x = 192,939,954,305.28
  5. Step 5: Solve for x
    x = 192,939,954,305.28/391,518.40
  6. Step 6: Final answer
    x = 492,799.20

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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.