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Finding the Fourth Proportional to 19,856.93, 29,786.11 and 9,990.84

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Solution

The fourth proportional to 19,856.93, 29,786.11 and 9,990.84 is: 14,986.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,856.93 : 29,786.11 = 9,990.84 : x
  2. Step 2: Convert to fraction form
    19,856.93/29,786.11 = 9,990.84/x
  3. Step 3: Cross multiply
    19,856.93x = 29,786.11 × 9,990.84
  4. Step 4: Simplify right side
    19,856.93x = 297,588,259.23
  5. Step 5: Solve for x
    x = 297,588,259.23/19,856.93
  6. Step 6: Final answer
    x = 14,986.62

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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.