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Finding the Fourth Proportional to 8,885.69, 12,256.78 and 7,121.51

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Solution

The fourth proportional to 8,885.69, 12,256.78 and 7,121.51 is: 9,823.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,885.69 : 12,256.78 = 7,121.51 : x
  2. Step 2: Convert to fraction form
    8,885.69/12,256.78 = 7,121.51/x
  3. Step 3: Cross multiply
    8,885.69x = 12,256.78 × 7,121.51
  4. Step 4: Simplify right side
    8,885.69x = 87,286,781.34
  5. Step 5: Solve for x
    x = 87,286,781.34/8,885.69
  6. Step 6: Final answer
    x = 9,823.30

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Half scale
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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.