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Finding the Fourth Proportional to 391,857.40, 587,348.70 and 223,458.40

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Solution

The fourth proportional to 391,857.40, 587,348.70 and 223,458.40 is: 334,938.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,857.40 : 587,348.70 = 223,458.40 : x
  2. Step 2: Convert to fraction form
    391,857.40/587,348.70 = 223,458.40/x
  3. Step 3: Cross multiply
    391,857.40x = 587,348.70 × 223,458.40
  4. Step 4: Simplify right side
    391,857.40x = 131,248,000,744.08
  5. Step 5: Solve for x
    x = 131,248,000,744.08/391,857.40
  6. Step 6: Final answer
    x = 334,938.17

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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.