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Finding the Fourth Proportional to 520,026.20, 780,039.30 and 485,034.20

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Solution

The fourth proportional to 520,026.20, 780,039.30 and 485,034.20 is: 727,551.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,026.20 : 780,039.30 = 485,034.20 : x
  2. Step 2: Convert to fraction form
    520,026.20/780,039.30 = 485,034.20/x
  3. Step 3: Cross multiply
    520,026.20x = 780,039.30 × 485,034.20
  4. Step 4: Simplify right side
    520,026.20x = 378,345,737,844.06
  5. Step 5: Solve for x
    x = 378,345,737,844.06/520,026.20
  6. Step 6: Final answer
    x = 727,551.30

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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.