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Finding the Fourth Proportional to 1,272.69, 1,907.43 and 579.15

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Solution

The fourth proportional to 1,272.69, 1,907.43 and 579.15 is: 867.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.69 : 1,907.43 = 579.15 : x
  2. Step 2: Convert to fraction form
    1,272.69/1,907.43 = 579.15/x
  3. Step 3: Cross multiply
    1,272.69x = 1,907.43 × 579.15
  4. Step 4: Simplify right side
    1,272.69x = 1,104,688.08
  5. Step 5: Solve for x
    x = 1,104,688.08/1,272.69
  6. Step 6: Final answer
    x = 867.99

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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.