Home / 728,438.40-1,091,491.20-478,828.80

Finding the Fourth Proportional to 728,438.40, 1,091,491.20 and 478,828.80

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Solution

The fourth proportional to 728,438.40, 1,091,491.20 and 478,828.80 is: 717,476.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    728,438.40 : 1,091,491.20 = 478,828.80 : x
  2. Step 2: Convert to fraction form
    728,438.40/1,091,491.20 = 478,828.80/x
  3. Step 3: Cross multiply
    728,438.40x = 1,091,491.20 × 478,828.80
  4. Step 4: Simplify right side
    728,438.40x = 522,637,421,506.56
  5. Step 5: Solve for x
    x = 522,637,421,506.56/728,438.40
  6. Step 6: Final answer
    x = 717,476.48

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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.