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Finding the Fourth Proportional to 21,489.60, 32,272.80 and 15,652.80

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Solution

The fourth proportional to 21,489.60, 32,272.80 and 15,652.80 is: 23,507.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,489.60 : 32,272.80 = 15,652.80 : x
  2. Step 2: Convert to fraction form
    21,489.60/32,272.80 = 15,652.80/x
  3. Step 3: Cross multiply
    21,489.60x = 32,272.80 × 15,652.80
  4. Step 4: Simplify right side
    21,489.60x = 505,159,683.84
  5. Step 5: Solve for x
    x = 505,159,683.84/21,489.60
  6. Step 6: Final answer
    x = 23,507.17

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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.