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Finding the Fourth Proportional to 395,947.20, 593,920.80 and 390,042.30

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Solution

The fourth proportional to 395,947.20, 593,920.80 and 390,042.30 is: 585,063.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,947.20 : 593,920.80 = 390,042.30 : x
  2. Step 2: Convert to fraction form
    395,947.20/593,920.80 = 390,042.30/x
  3. Step 3: Cross multiply
    395,947.20x = 593,920.80 × 390,042.30
  4. Step 4: Simplify right side
    395,947.20x = 231,654,234,849.84
  5. Step 5: Solve for x
    x = 231,654,234,849.84/395,947.20
  6. Step 6: Final answer
    x = 585,063.45

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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.