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Finding the Fourth Proportional to 15,281, 21,079.14 and 8,906.84

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Solution

The fourth proportional to 15,281, 21,079.14 and 8,906.84 is: 12,286.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,281 : 21,079.14 = 8,906.84 : x
  2. Step 2: Convert to fraction form
    15,281/21,079.14 = 8,906.84/x
  3. Step 3: Cross multiply
    15,281x = 21,079.14 × 8,906.84
  4. Step 4: Simplify right side
    15,281x = 187,748,527.32
  5. Step 5: Solve for x
    x = 187,748,527.32/15,281
  6. Step 6: Final answer
    x = 12,286.40

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1.5x scale

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.