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Finding the Fourth Proportional to 743.69, 1,115.69 and 256.75

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Solution

The fourth proportional to 743.69, 1,115.69 and 256.75 is: 385.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.69 : 1,115.69 = 256.75 : x
  2. Step 2: Convert to fraction form
    743.69/1,115.69 = 256.75/x
  3. Step 3: Cross multiply
    743.69x = 1,115.69 × 256.75
  4. Step 4: Simplify right side
    743.69x = 286,449.33
  5. Step 5: Solve for x
    x = 286,449.33/743.69
  6. Step 6: Final answer
    x = 385.17

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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.