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Finding the Fourth Proportional to 18,747.86, 28,127.93 and 7,663.87

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Solution

The fourth proportional to 18,747.86, 28,127.93 and 7,663.87 is: 11,498.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,747.86 : 28,127.93 = 7,663.87 : x
  2. Step 2: Convert to fraction form
    18,747.86/28,127.93 = 7,663.87/x
  3. Step 3: Cross multiply
    18,747.86x = 28,127.93 × 7,663.87
  4. Step 4: Simplify right side
    18,747.86x = 215,568,702.17
  5. Step 5: Solve for x
    x = 215,568,702.17/18,747.86
  6. Step 6: Final answer
    x = 11,498.31

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1.5x scale

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.