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Finding the Fourth Proportional to 1,281.79, 1,921.29 and 843.22

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Solution

The fourth proportional to 1,281.79, 1,921.29 and 843.22 is: 1,263.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.79 : 1,921.29 = 843.22 : x
  2. Step 2: Convert to fraction form
    1,281.79/1,921.29 = 843.22/x
  3. Step 3: Cross multiply
    1,281.79x = 1,921.29 × 843.22
  4. Step 4: Simplify right side
    1,281.79x = 1,620,070.15
  5. Step 5: Solve for x
    x = 1,620,070.15/1,281.79
  6. Step 6: Final answer
    x = 1,263.91

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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.