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Finding the Fourth Proportional to 743.64, 1,115.47 and 281.63

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Solution

The fourth proportional to 743.64, 1,115.47 and 281.63 is: 422.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.64 : 1,115.47 = 281.63 : x
  2. Step 2: Convert to fraction form
    743.64/1,115.47 = 281.63/x
  3. Step 3: Cross multiply
    743.64x = 1,115.47 × 281.63
  4. Step 4: Simplify right side
    743.64x = 314,149.82
  5. Step 5: Solve for x
    x = 314,149.82/743.64
  6. Step 6: Final answer
    x = 422.45

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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.