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Finding the Fourth Proportional to 45,981, 68,909.13 and 20,990.07

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Solution

The fourth proportional to 45,981, 68,909.13 and 20,990.07 is: 31,456.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,981 : 68,909.13 = 20,990.07 : x
  2. Step 2: Convert to fraction form
    45,981/68,909.13 = 20,990.07/x
  3. Step 3: Cross multiply
    45,981x = 68,909.13 × 20,990.07
  4. Step 4: Simplify right side
    45,981x = 1,446,407,462.34
  5. Step 5: Solve for x
    x = 1,446,407,462.34/45,981
  6. Step 6: Final answer
    x = 31,456.63

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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.