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Finding the Fourth Proportional to 13,099.60, 19,649.40 and 12,905.20

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Solution

The fourth proportional to 13,099.60, 19,649.40 and 12,905.20 is: 19,357.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,099.60 : 19,649.40 = 12,905.20 : x
  2. Step 2: Convert to fraction form
    13,099.60/19,649.40 = 12,905.20/x
  3. Step 3: Cross multiply
    13,099.60x = 19,649.40 × 12,905.20
  4. Step 4: Simplify right side
    13,099.60x = 253,579,436.88
  5. Step 5: Solve for x
    x = 253,579,436.88/13,099.60
  6. Step 6: Final answer
    x = 19,357.80

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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.