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Finding the Fourth Proportional to 15,438.28, 21,304.80 and 8,364.88

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Solution

The fourth proportional to 15,438.28, 21,304.80 and 8,364.88 is: 11,543.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,438.28 : 21,304.80 = 8,364.88 : x
  2. Step 2: Convert to fraction form
    15,438.28/21,304.80 = 8,364.88/x
  3. Step 3: Cross multiply
    15,438.28x = 21,304.80 × 8,364.88
  4. Step 4: Simplify right side
    15,438.28x = 178,212,095.42
  5. Step 5: Solve for x
    x = 178,212,095.42/15,438.28
  6. Step 6: Final answer
    x = 11,543.52

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.