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Finding the Fourth Proportional to 391,995.20, 586,437.60 and 339,982.40

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Solution

The fourth proportional to 391,995.20, 586,437.60 and 339,982.40 is: 508,624.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,995.20 : 586,437.60 = 339,982.40 : x
  2. Step 2: Convert to fraction form
    391,995.20/586,437.60 = 339,982.40/x
  3. Step 3: Cross multiply
    391,995.20x = 586,437.60 × 339,982.40
  4. Step 4: Simplify right side
    391,995.20x = 199,378,462,698.24
  5. Step 5: Solve for x
    x = 199,378,462,698.24/391,995.20
  6. Step 6: Final answer
    x = 508,624.76

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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.