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Finding the Fourth Proportional to 12,905.87, 17,809.47 and 7,239.92

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Solution

The fourth proportional to 12,905.87, 17,809.47 and 7,239.92 is: 9,990.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.87 : 17,809.47 = 7,239.92 : x
  2. Step 2: Convert to fraction form
    12,905.87/17,809.47 = 7,239.92/x
  3. Step 3: Cross multiply
    12,905.87x = 17,809.47 × 7,239.92
  4. Step 4: Simplify right side
    12,905.87x = 128,939,138.04
  5. Step 5: Solve for x
    x = 128,939,138.04/12,905.87
  6. Step 6: Final answer
    x = 9,990.74

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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.