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Finding the Fourth Proportional to 9,988.70, 13,789.40 and 6,213.08

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Solution

The fourth proportional to 9,988.70, 13,789.40 and 6,213.08 is: 8,577.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,988.70 : 13,789.40 = 6,213.08 : x
  2. Step 2: Convert to fraction form
    9,988.70/13,789.40 = 6,213.08/x
  3. Step 3: Cross multiply
    9,988.70x = 13,789.40 × 6,213.08
  4. Step 4: Simplify right side
    9,988.70x = 85,674,597.05
  5. Step 5: Solve for x
    x = 85,674,597.05/9,988.70
  6. Step 6: Final answer
    x = 8,577.15

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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.