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Finding the Fourth Proportional to 13,988.70, 21,000.87 and 12,026.88

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Solution

The fourth proportional to 13,988.70, 21,000.87 and 12,026.88 is: 18,055.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988.70 : 21,000.87 = 12,026.88 : x
  2. Step 2: Convert to fraction form
    13,988.70/21,000.87 = 12,026.88/x
  3. Step 3: Cross multiply
    13,988.70x = 21,000.87 × 12,026.88
  4. Step 4: Simplify right side
    13,988.70x = 252,574,943.39
  5. Step 5: Solve for x
    x = 252,574,943.39/13,988.70
  6. Step 6: Final answer
    x = 18,055.64

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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.