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Finding the Fourth Proportional to 7,419.60, 11,128.68 and 1,947.60

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Solution

The fourth proportional to 7,419.60, 11,128.68 and 1,947.60 is: 2,921.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,419.60 : 11,128.68 = 1,947.60 : x
  2. Step 2: Convert to fraction form
    7,419.60/11,128.68 = 1,947.60/x
  3. Step 3: Cross multiply
    7,419.60x = 11,128.68 × 1,947.60
  4. Step 4: Simplify right side
    7,419.60x = 21,674,217.17
  5. Step 5: Solve for x
    x = 21,674,217.17/7,419.60
  6. Step 6: Final answer
    x = 2,921.21

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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.