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Finding the Fourth Proportional to 1,272, 1,908.18 and 578.55

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Solution

The fourth proportional to 1,272, 1,908.18 and 578.55 is: 867.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272 : 1,908.18 = 578.55 : x
  2. Step 2: Convert to fraction form
    1,272/1,908.18 = 578.55/x
  3. Step 3: Cross multiply
    1,272x = 1,908.18 × 578.55
  4. Step 4: Simplify right side
    1,272x = 1,103,977.54
  5. Step 5: Solve for x
    x = 1,103,977.54/1,272
  6. Step 6: Final answer
    x = 867.91

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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.