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Finding the Fourth Proportional to 4,743.72, 7,116 and 1,281

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Solution

The fourth proportional to 4,743.72, 7,116 and 1,281 is: 1,921.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,743.72 : 7,116 = 1,281 : x
  2. Step 2: Convert to fraction form
    4,743.72/7,116 = 1,281/x
  3. Step 3: Cross multiply
    4,743.72x = 7,116 × 1,281
  4. Step 4: Simplify right side
    4,743.72x = 9,115,596
  5. Step 5: Solve for x
    x = 9,115,596/4,743.72
  6. Step 6: Final answer
    x = 1,921.61

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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.