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Finding the Fourth Proportional to 13,899.60, 19,180.80 and 7,930.80

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Solution

The fourth proportional to 13,899.60, 19,180.80 and 7,930.80 is: 10,944.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,899.60 : 19,180.80 = 7,930.80 : x
  2. Step 2: Convert to fraction form
    13,899.60/19,180.80 = 7,930.80/x
  3. Step 3: Cross multiply
    13,899.60x = 19,180.80 × 7,930.80
  4. Step 4: Simplify right side
    13,899.60x = 152,119,088.64
  5. Step 5: Solve for x
    x = 152,119,088.64/13,899.60
  6. Step 6: Final answer
    x = 10,944.13

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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.