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Finding the Fourth Proportional to 19,991.25, 30,005.04 and 10,639.08

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Solution

The fourth proportional to 19,991.25, 30,005.04 and 10,639.08 is: 15,968.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.25 : 30,005.04 = 10,639.08 : x
  2. Step 2: Convert to fraction form
    19,991.25/30,005.04 = 10,639.08/x
  3. Step 3: Cross multiply
    19,991.25x = 30,005.04 × 10,639.08
  4. Step 4: Simplify right side
    19,991.25x = 319,226,020.96
  5. Step 5: Solve for x
    x = 319,226,020.96/19,991.25
  6. Step 6: Final answer
    x = 15,968.29

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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.