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Finding the Fourth Proportional to 15,174.40, 20,940.80 and 8,460.80

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Solution

The fourth proportional to 15,174.40, 20,940.80 and 8,460.80 is: 11,675.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,174.40 : 20,940.80 = 8,460.80 : x
  2. Step 2: Convert to fraction form
    15,174.40/20,940.80 = 8,460.80/x
  3. Step 3: Cross multiply
    15,174.40x = 20,940.80 × 8,460.80
  4. Step 4: Simplify right side
    15,174.40x = 177,175,920.64
  5. Step 5: Solve for x
    x = 177,175,920.64/15,174.40
  6. Step 6: Final answer
    x = 11,675.98

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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.