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Finding the Fourth Proportional to 21,687.60, 32,515.04 and 11,835.28

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Solution

The fourth proportional to 21,687.60, 32,515.04 and 11,835.28 is: 17,743.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.60 : 32,515.04 = 11,835.28 : x
  2. Step 2: Convert to fraction form
    21,687.60/32,515.04 = 11,835.28/x
  3. Step 3: Cross multiply
    21,687.60x = 32,515.04 × 11,835.28
  4. Step 4: Simplify right side
    21,687.60x = 384,824,602.61
  5. Step 5: Solve for x
    x = 384,824,602.61/21,687.60
  6. Step 6: Final answer
    x = 17,743.99

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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.