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Finding the Fourth Proportional to 13,609.68, 18,775.16 and 9,128.76

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Solution

The fourth proportional to 13,609.68, 18,775.16 and 9,128.76 is: 12,593.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.68 : 18,775.16 = 9,128.76 : x
  2. Step 2: Convert to fraction form
    13,609.68/18,775.16 = 9,128.76/x
  3. Step 3: Cross multiply
    13,609.68x = 18,775.16 × 9,128.76
  4. Step 4: Simplify right side
    13,609.68x = 171,393,929.60
  5. Step 5: Solve for x
    x = 171,393,929.60/13,609.68
  6. Step 6: Final answer
    x = 12,593.53

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Half scale
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Double 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.