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Finding the Fourth Proportional to 19,008.12, 28,490.94 and 7,911.12

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Solution

The fourth proportional to 19,008.12, 28,490.94 and 7,911.12 is: 11,857.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,008.12 : 28,490.94 = 7,911.12 : x
  2. Step 2: Convert to fraction form
    19,008.12/28,490.94 = 7,911.12/x
  3. Step 3: Cross multiply
    19,008.12x = 28,490.94 × 7,911.12
  4. Step 4: Simplify right side
    19,008.12x = 225,395,245.25
  5. Step 5: Solve for x
    x = 225,395,245.25/19,008.12
  6. Step 6: Final answer
    x = 11,857.84

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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.