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Finding the Fourth Proportional to 18,918.72, 28,369.28 and 5,772.48

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Solution

The fourth proportional to 18,918.72, 28,369.28 and 5,772.48 is: 8,656.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.72 : 28,369.28 = 5,772.48 : x
  2. Step 2: Convert to fraction form
    18,918.72/28,369.28 = 5,772.48/x
  3. Step 3: Cross multiply
    18,918.72x = 28,369.28 × 5,772.48
  4. Step 4: Simplify right side
    18,918.72x = 163,761,101.41
  5. Step 5: Solve for x
    x = 163,761,101.41/18,918.72
  6. Step 6: Final answer
    x = 8,656.03

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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.