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Finding the Fourth Proportional to 520,011.90, 780,093.45 and 220,491.90

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Solution

The fourth proportional to 520,011.90, 780,093.45 and 220,491.90 is: 330,769.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,011.90 : 780,093.45 = 220,491.90 : x
  2. Step 2: Convert to fraction form
    520,011.90/780,093.45 = 220,491.90/x
  3. Step 3: Cross multiply
    520,011.90x = 780,093.45 × 220,491.90
  4. Step 4: Simplify right side
    520,011.90x = 172,004,286,968.06
  5. Step 5: Solve for x
    x = 172,004,286,968.06/520,011.90
  6. Step 6: Final answer
    x = 330,769.91

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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.