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Finding the Fourth Proportional to 18,865.78, 28,304.80 and 9,003.78

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Solution

The fourth proportional to 18,865.78, 28,304.80 and 9,003.78 is: 13,508.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.78 : 28,304.80 = 9,003.78 : x
  2. Step 2: Convert to fraction form
    18,865.78/28,304.80 = 9,003.78/x
  3. Step 3: Cross multiply
    18,865.78x = 28,304.80 × 9,003.78
  4. Step 4: Simplify right side
    18,865.78x = 254,850,192.14
  5. Step 5: Solve for x
    x = 254,850,192.14/18,865.78
  6. Step 6: Final answer
    x = 13,508.60

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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.