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Finding the Fourth Proportional to 19,687.60, 29,531.40 and 11,911.60

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Solution

The fourth proportional to 19,687.60, 29,531.40 and 11,911.60 is: 17,867.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,687.60 : 29,531.40 = 11,911.60 : x
  2. Step 2: Convert to fraction form
    19,687.60/29,531.40 = 11,911.60/x
  3. Step 3: Cross multiply
    19,687.60x = 29,531.40 × 11,911.60
  4. Step 4: Simplify right side
    19,687.60x = 351,766,224.24
  5. Step 5: Solve for x
    x = 351,766,224.24/19,687.60
  6. Step 6: Final answer
    x = 17,867.40

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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.