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Finding the Fourth Proportional to 391,002.99, 539,124.41 and 313,416.60

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Solution

The fourth proportional to 391,002.99, 539,124.41 and 313,416.60 is: 432,146.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,002.99 : 539,124.41 = 313,416.60 : x
  2. Step 2: Convert to fraction form
    391,002.99/539,124.41 = 313,416.60/x
  3. Step 3: Cross multiply
    391,002.99x = 539,124.41 × 313,416.60
  4. Step 4: Simplify right side
    391,002.99x = 168,970,540,348.78
  5. Step 5: Solve for x
    x = 168,970,540,348.78/391,002.99
  6. Step 6: Final answer
    x = 432,146.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.