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Finding the Fourth Proportional to 21,405.80, 32,108.70 and 19,109.45

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Solution

The fourth proportional to 21,405.80, 32,108.70 and 19,109.45 is: 28,664.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,405.80 : 32,108.70 = 19,109.45 : x
  2. Step 2: Convert to fraction form
    21,405.80/32,108.70 = 19,109.45/x
  3. Step 3: Cross multiply
    21,405.80x = 32,108.70 × 19,109.45
  4. Step 4: Simplify right side
    21,405.80x = 613,579,597.22
  5. Step 5: Solve for x
    x = 613,579,597.22/21,405.80
  6. Step 6: Final answer
    x = 28,664.18

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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.