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Finding the Fourth Proportional to 1,291.74, 1,782.68 and 872.92

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Solution

The fourth proportional to 1,291.74, 1,782.68 and 872.92 is: 1,204.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.74 : 1,782.68 = 872.92 : x
  2. Step 2: Convert to fraction form
    1,291.74/1,782.68 = 872.92/x
  3. Step 3: Cross multiply
    1,291.74x = 1,782.68 × 872.92
  4. Step 4: Simplify right side
    1,291.74x = 1,556,134.75
  5. Step 5: Solve for x
    x = 1,556,134.75/1,291.74
  6. Step 6: Final answer
    x = 1,204.68

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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.