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Finding the Fourth Proportional to 19,990.56, 29,990.70 and 6,849.12

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Solution

The fourth proportional to 19,990.56, 29,990.70 and 6,849.12 is: 10,275.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.56 : 29,990.70 = 6,849.12 : x
  2. Step 2: Convert to fraction form
    19,990.56/29,990.70 = 6,849.12/x
  3. Step 3: Cross multiply
    19,990.56x = 29,990.70 × 6,849.12
  4. Step 4: Simplify right side
    19,990.56x = 205,409,903.18
  5. Step 5: Solve for x
    x = 205,409,903.18/19,990.56
  6. Step 6: Final answer
    x = 10,275.35

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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.