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Finding the Fourth Proportional to 743.81, 1,115.87 and 256.80

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Solution

The fourth proportional to 743.81, 1,115.87 and 256.80 is: 385.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.81 : 1,115.87 = 256.80 : x
  2. Step 2: Convert to fraction form
    743.81/1,115.87 = 256.80/x
  3. Step 3: Cross multiply
    743.81x = 1,115.87 × 256.80
  4. Step 4: Simplify right side
    743.81x = 286,555.42
  5. Step 5: Solve for x
    x = 286,555.42/743.81
  6. Step 6: Final answer
    x = 385.25

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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.