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Finding the Fourth Proportional to 1,291.52, 1,933.68 and 742.88

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Solution

The fourth proportional to 1,291.52, 1,933.68 and 742.88 is: 1,112.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.52 : 1,933.68 = 742.88 : x
  2. Step 2: Convert to fraction form
    1,291.52/1,933.68 = 742.88/x
  3. Step 3: Cross multiply
    1,291.52x = 1,933.68 × 742.88
  4. Step 4: Simplify right side
    1,291.52x = 1,436,492.20
  5. Step 5: Solve for x
    x = 1,436,492.20/1,291.52
  6. Step 6: Final answer
    x = 1,112.25

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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.