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Finding the Fourth Proportional to 743.79, 1,115.30 and 256.73

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Solution

The fourth proportional to 743.79, 1,115.30 and 256.73 is: 384.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.79 : 1,115.30 = 256.73 : x
  2. Step 2: Convert to fraction form
    743.79/1,115.30 = 256.73/x
  3. Step 3: Cross multiply
    743.79x = 1,115.30 × 256.73
  4. Step 4: Simplify right side
    743.79x = 286,324.11
  5. Step 5: Solve for x
    x = 286,324.11/743.79
  6. Step 6: Final answer
    x = 384.95

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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.