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Finding the Fourth Proportional to 619,128.40, 927,137.40 and 407,621.20

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Solution

The fourth proportional to 619,128.40, 927,137.40 and 407,621.20 is: 610,407.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,128.40 : 927,137.40 = 407,621.20 : x
  2. Step 2: Convert to fraction form
    619,128.40/927,137.40 = 407,621.20/x
  3. Step 3: Cross multiply
    619,128.40x = 927,137.40 × 407,621.20
  4. Step 4: Simplify right side
    619,128.40x = 377,920,859,552.88
  5. Step 5: Solve for x
    x = 377,920,859,552.88/619,128.40
  6. Step 6: Final answer
    x = 610,407.89

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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.