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Finding the Fourth Proportional to 21,380.80, 32,030.40 and 11,516.80

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Solution

The fourth proportional to 21,380.80, 32,030.40 and 11,516.80 is: 17,253.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,380.80 : 32,030.40 = 11,516.80 : x
  2. Step 2: Convert to fraction form
    21,380.80/32,030.40 = 11,516.80/x
  3. Step 3: Cross multiply
    21,380.80x = 32,030.40 × 11,516.80
  4. Step 4: Simplify right side
    21,380.80x = 368,887,710.72
  5. Step 5: Solve for x
    x = 368,887,710.72/21,380.80
  6. Step 6: Final answer
    x = 17,253.22

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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.