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Finding the Fourth Proportional to 812,342.84, 1,218,630.89 and 279,720.86

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Solution

The fourth proportional to 812,342.84, 1,218,630.89 and 279,720.86 is: 419,621.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,342.84 : 1,218,630.89 = 279,720.86 : x
  2. Step 2: Convert to fraction form
    812,342.84/1,218,630.89 = 279,720.86/x
  3. Step 3: Cross multiply
    812,342.84x = 1,218,630.89 × 279,720.86
  4. Step 4: Simplify right side
    812,342.84x = 340,876,475,179.51
  5. Step 5: Solve for x
    x = 340,876,475,179.51/812,342.84
  6. Step 6: Final answer
    x = 419,621.45

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1.5x scale

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.