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Finding the Fourth Proportional to 1,143.41, 1,715.11 and 277.72

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Solution

The fourth proportional to 1,143.41, 1,715.11 and 277.72 is: 416.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.41 : 1,715.11 = 277.72 : x
  2. Step 2: Convert to fraction form
    1,143.41/1,715.11 = 277.72/x
  3. Step 3: Cross multiply
    1,143.41x = 1,715.11 × 277.72
  4. Step 4: Simplify right side
    1,143.41x = 476,320.35
  5. Step 5: Solve for x
    x = 476,320.35/1,143.41
  6. Step 6: Final answer
    x = 416.58

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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.