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Finding the Fourth Proportional to 279,780.48, 419,437.44 and 139,345.92

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Solution

The fourth proportional to 279,780.48, 419,437.44 and 139,345.92 is: 208,902.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,780.48 : 419,437.44 = 139,345.92 : x
  2. Step 2: Convert to fraction form
    279,780.48/419,437.44 = 139,345.92/x
  3. Step 3: Cross multiply
    279,780.48x = 419,437.44 × 139,345.92
  4. Step 4: Simplify right side
    279,780.48x = 58,446,895,959.24
  5. Step 5: Solve for x
    x = 58,446,895,959.24/279,780.48
  6. Step 6: Final answer
    x = 208,902.69

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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.