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Finding the Fourth Proportional to 519,278.80, 778,860.60 and 425,621.20

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Solution

The fourth proportional to 519,278.80, 778,860.60 and 425,621.20 is: 638,384.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,278.80 : 778,860.60 = 425,621.20 : x
  2. Step 2: Convert to fraction form
    519,278.80/778,860.60 = 425,621.20/x
  3. Step 3: Cross multiply
    519,278.80x = 778,860.60 × 425,621.20
  4. Step 4: Simplify right side
    519,278.80x = 331,499,583,204.72
  5. Step 5: Solve for x
    x = 331,499,583,204.72/519,278.80
  6. Step 6: Final answer
    x = 638,384.59

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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.