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Finding the Fourth Proportional to 12,239.81, 16,890.54 and 7,202.87

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Solution

The fourth proportional to 12,239.81, 16,890.54 and 7,202.87 is: 9,939.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,239.81 : 16,890.54 = 7,202.87 : x
  2. Step 2: Convert to fraction form
    12,239.81/16,890.54 = 7,202.87/x
  3. Step 3: Cross multiply
    12,239.81x = 16,890.54 × 7,202.87
  4. Step 4: Simplify right side
    12,239.81x = 121,660,279.40
  5. Step 5: Solve for x
    x = 121,660,279.40/12,239.81
  6. Step 6: Final answer
    x = 9,939.72

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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.