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Finding the Fourth Proportional to 1,515, 2,272.68 and 784.20

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Solution

The fourth proportional to 1,515, 2,272.68 and 784.20 is: 1,176.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515 : 2,272.68 = 784.20 : x
  2. Step 2: Convert to fraction form
    1,515/2,272.68 = 784.20/x
  3. Step 3: Cross multiply
    1,515x = 2,272.68 × 784.20
  4. Step 4: Simplify right side
    1,515x = 1,782,235.66
  5. Step 5: Solve for x
    x = 1,782,235.66/1,515
  6. Step 6: Final answer
    x = 1,176.39

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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.