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Finding the Fourth Proportional to 21,666.42, 32,504.40 and 7,815.42

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Solution

The fourth proportional to 21,666.42, 32,504.40 and 7,815.42 is: 11,724.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,666.42 : 32,504.40 = 7,815.42 : x
  2. Step 2: Convert to fraction form
    21,666.42/32,504.40 = 7,815.42/x
  3. Step 3: Cross multiply
    21,666.42x = 32,504.40 × 7,815.42
  4. Step 4: Simplify right side
    21,666.42x = 254,035,537.85
  5. Step 5: Solve for x
    x = 254,035,537.85/21,666.42
  6. Step 6: Final answer
    x = 11,724.85

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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.