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Finding the Fourth Proportional to 18,627.60, 27,938.70 and 5,478.60

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Solution

The fourth proportional to 18,627.60, 27,938.70 and 5,478.60 is: 8,217.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,627.60 : 27,938.70 = 5,478.60 : x
  2. Step 2: Convert to fraction form
    18,627.60/27,938.70 = 5,478.60/x
  3. Step 3: Cross multiply
    18,627.60x = 27,938.70 × 5,478.60
  4. Step 4: Simplify right side
    18,627.60x = 153,064,961.82
  5. Step 5: Solve for x
    x = 153,064,961.82/18,627.60
  6. Step 6: Final answer
    x = 8,217.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.