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Finding the Fourth Proportional to 9,988.68, 13,790.34 and 8,881.64

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Solution

The fourth proportional to 9,988.68, 13,790.34 and 8,881.64 is: 12,261.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,988.68 : 13,790.34 = 8,881.64 : x
  2. Step 2: Convert to fraction form
    9,988.68/13,790.34 = 8,881.64/x
  3. Step 3: Cross multiply
    9,988.68x = 13,790.34 × 8,881.64
  4. Step 4: Simplify right side
    9,988.68x = 122,480,835.36
  5. Step 5: Solve for x
    x = 122,480,835.36/9,988.68
  6. Step 6: Final answer
    x = 12,261.96

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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.