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Finding the Fourth Proportional to 18,289.12, 25,239.12 and 9,905.68

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Solution

The fourth proportional to 18,289.12, 25,239.12 and 9,905.68 is: 13,669.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,289.12 : 25,239.12 = 9,905.68 : x
  2. Step 2: Convert to fraction form
    18,289.12/25,239.12 = 9,905.68/x
  3. Step 3: Cross multiply
    18,289.12x = 25,239.12 × 9,905.68
  4. Step 4: Simplify right side
    18,289.12x = 250,010,646.20
  5. Step 5: Solve for x
    x = 250,010,646.20/18,289.12
  6. Step 6: Final answer
    x = 13,669.91

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.