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Finding the Fourth Proportional to 21,990.80, 32,913.30 and 15,429.80

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Solution

The fourth proportional to 21,990.80, 32,913.30 and 15,429.80 is: 23,093.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.80 : 32,913.30 = 15,429.80 : x
  2. Step 2: Convert to fraction form
    21,990.80/32,913.30 = 15,429.80/x
  3. Step 3: Cross multiply
    21,990.80x = 32,913.30 × 15,429.80
  4. Step 4: Simplify right side
    21,990.80x = 507,845,636.34
  5. Step 5: Solve for x
    x = 507,845,636.34/21,990.80
  6. Step 6: Final answer
    x = 23,093.55

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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.