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Finding the Fourth Proportional to 21,990.69, 32,994.34 and 13,231.76

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Solution

The fourth proportional to 21,990.69, 32,994.34 and 13,231.76 is: 19,852.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.69 : 32,994.34 = 13,231.76 : x
  2. Step 2: Convert to fraction form
    21,990.69/32,994.34 = 13,231.76/x
  3. Step 3: Cross multiply
    21,990.69x = 32,994.34 × 13,231.76
  4. Step 4: Simplify right side
    21,990.69x = 436,572,990.19
  5. Step 5: Solve for x
    x = 436,572,990.19/21,990.69
  6. Step 6: Final answer
    x = 19,852.63

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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.