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Finding the Fourth Proportional to 2,276, 3,140.88 and 1,391.66

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Solution

The fourth proportional to 2,276, 3,140.88 and 1,391.66 is: 1,920.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,276 : 3,140.88 = 1,391.66 : x
  2. Step 2: Convert to fraction form
    2,276/3,140.88 = 1,391.66/x
  3. Step 3: Cross multiply
    2,276x = 3,140.88 × 1,391.66
  4. Step 4: Simplify right side
    2,276x = 4,371,037.06
  5. Step 5: Solve for x
    x = 4,371,037.06/2,276
  6. Step 6: Final answer
    x = 1,920.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.