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Finding the Fourth Proportional to 18,515.63, 27,776.34 and 7,988.61

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Solution

The fourth proportional to 18,515.63, 27,776.34 and 7,988.61 is: 11,984.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,515.63 : 27,776.34 = 7,988.61 : x
  2. Step 2: Convert to fraction form
    18,515.63/27,776.34 = 7,988.61/x
  3. Step 3: Cross multiply
    18,515.63x = 27,776.34 × 7,988.61
  4. Step 4: Simplify right side
    18,515.63x = 221,894,347.49
  5. Step 5: Solve for x
    x = 221,894,347.49/18,515.63
  6. Step 6: Final answer
    x = 11,984.17

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1.5x scale

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.