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Finding the Fourth Proportional to 720,019.20, 1,080,028.80 and 521,731.20

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Solution

The fourth proportional to 720,019.20, 1,080,028.80 and 521,731.20 is: 782,596.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,019.20 : 1,080,028.80 = 521,731.20 : x
  2. Step 2: Convert to fraction form
    720,019.20/1,080,028.80 = 521,731.20/x
  3. Step 3: Cross multiply
    720,019.20x = 1,080,028.80 × 521,731.20
  4. Step 4: Simplify right side
    720,019.20x = 563,484,721,858.56
  5. Step 5: Solve for x
    x = 563,484,721,858.56/720,019.20
  6. Step 6: Final answer
    x = 782,596.80

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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.