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Finding the Fourth Proportional to 15,415.68, 21,276 and 8,704

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Solution

The fourth proportional to 15,415.68, 21,276 and 8,704 is: 12,012.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,415.68 : 21,276 = 8,704 : x
  2. Step 2: Convert to fraction form
    15,415.68/21,276 = 8,704/x
  3. Step 3: Cross multiply
    15,415.68x = 21,276 × 8,704
  4. Step 4: Simplify right side
    15,415.68x = 185,186,304
  5. Step 5: Solve for x
    x = 185,186,304/15,415.68
  6. Step 6: Final answer
    x = 12,012.85

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Why These Related Problems?

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