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Finding the Fourth Proportional to 1,917.76, 2,876.88 and 668.24

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Solution

The fourth proportional to 1,917.76, 2,876.88 and 668.24 is: 1,002.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.76 : 2,876.88 = 668.24 : x
  2. Step 2: Convert to fraction form
    1,917.76/2,876.88 = 668.24/x
  3. Step 3: Cross multiply
    1,917.76x = 2,876.88 × 668.24
  4. Step 4: Simplify right side
    1,917.76x = 1,922,446.29
  5. Step 5: Solve for x
    x = 1,922,446.29/1,917.76
  6. Step 6: Final answer
    x = 1,002.44

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1.5x scale

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.