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Finding the Fourth Proportional to 12,858.40, 19,287.60 and 12,761.20

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Solution

The fourth proportional to 12,858.40, 19,287.60 and 12,761.20 is: 19,141.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,858.40 : 19,287.60 = 12,761.20 : x
  2. Step 2: Convert to fraction form
    12,858.40/19,287.60 = 12,761.20/x
  3. Step 3: Cross multiply
    12,858.40x = 19,287.60 × 12,761.20
  4. Step 4: Simplify right side
    12,858.40x = 246,132,921.12
  5. Step 5: Solve for x
    x = 246,132,921.12/12,858.40
  6. Step 6: Final answer
    x = 19,141.80

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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.