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Finding the Fourth Proportional to 743.72, 1,115.76 and 455.36

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Solution

The fourth proportional to 743.72, 1,115.76 and 455.36 is: 683.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.72 : 1,115.76 = 455.36 : x
  2. Step 2: Convert to fraction form
    743.72/1,115.76 = 455.36/x
  3. Step 3: Cross multiply
    743.72x = 1,115.76 × 455.36
  4. Step 4: Simplify right side
    743.72x = 508,072.47
  5. Step 5: Solve for x
    x = 508,072.47/743.72
  6. Step 6: Final answer
    x = 683.15

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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.