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Finding the Fourth Proportional to 9,988.18, 13,789.65 and 8,881.14

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Solution

The fourth proportional to 9,988.18, 13,789.65 and 8,881.14 is: 12,261.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,988.18 : 13,789.65 = 8,881.14 : x
  2. Step 2: Convert to fraction form
    9,988.18/13,789.65 = 8,881.14/x
  3. Step 3: Cross multiply
    9,988.18x = 13,789.65 × 8,881.14
  4. Step 4: Simplify right side
    9,988.18x = 122,467,812.20
  5. Step 5: Solve for x
    x = 122,467,812.20/9,988.18
  6. Step 6: Final answer
    x = 12,261.27

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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.