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Finding the Fourth Proportional to 12,749.60, 19,138.80 and 9,840.80

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Solution

The fourth proportional to 12,749.60, 19,138.80 and 9,840.80 is: 14,772.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,749.60 : 19,138.80 = 9,840.80 : x
  2. Step 2: Convert to fraction form
    12,749.60/19,138.80 = 9,840.80/x
  3. Step 3: Cross multiply
    12,749.60x = 19,138.80 × 9,840.80
  4. Step 4: Simplify right side
    12,749.60x = 188,341,103.04
  5. Step 5: Solve for x
    x = 188,341,103.04/12,749.60
  6. Step 6: Final answer
    x = 14,772.31

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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.