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Finding the Fourth Proportional to 391,335.60, 587,440.80 and 302,980.80

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Solution

The fourth proportional to 391,335.60, 587,440.80 and 302,980.80 is: 454,809.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,335.60 : 587,440.80 = 302,980.80 : x
  2. Step 2: Convert to fraction form
    391,335.60/587,440.80 = 302,980.80/x
  3. Step 3: Cross multiply
    391,335.60x = 587,440.80 × 302,980.80
  4. Step 4: Simplify right side
    391,335.60x = 177,983,283,536.64
  5. Step 5: Solve for x
    x = 177,983,283,536.64/391,335.60
  6. Step 6: Final answer
    x = 454,809.84

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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.