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Finding the Fourth Proportional to 788.57, 1,182.40 and 268.31

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Solution

The fourth proportional to 788.57, 1,182.40 and 268.31 is: 402.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.57 : 1,182.40 = 268.31 : x
  2. Step 2: Convert to fraction form
    788.57/1,182.40 = 268.31/x
  3. Step 3: Cross multiply
    788.57x = 1,182.40 × 268.31
  4. Step 4: Simplify right side
    788.57x = 317,249.74
  5. Step 5: Solve for x
    x = 317,249.74/788.57
  6. Step 6: Final answer
    x = 402.31

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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.