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Finding the Fourth Proportional to 1,917.64, 2,876.64 and 822.10

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Solution

The fourth proportional to 1,917.64, 2,876.64 and 822.10 is: 1,233.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.64 : 2,876.64 = 822.10 : x
  2. Step 2: Convert to fraction form
    1,917.64/2,876.64 = 822.10/x
  3. Step 3: Cross multiply
    1,917.64x = 2,876.64 × 822.10
  4. Step 4: Simplify right side
    1,917.64x = 2,364,885.74
  5. Step 5: Solve for x
    x = 2,364,885.74/1,917.64
  6. Step 6: Final answer
    x = 1,233.23

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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.