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Finding the Fourth Proportional to 19,991.57, 30,005.64 and 10,137.65

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Solution

The fourth proportional to 19,991.57, 30,005.64 and 10,137.65 is: 15,215.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.57 : 30,005.64 = 10,137.65 : x
  2. Step 2: Convert to fraction form
    19,991.57/30,005.64 = 10,137.65/x
  3. Step 3: Cross multiply
    19,991.57x = 30,005.64 × 10,137.65
  4. Step 4: Simplify right side
    19,991.57x = 304,186,526.32
  5. Step 5: Solve for x
    x = 304,186,526.32/19,991.57
  6. Step 6: Final answer
    x = 15,215.74

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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.