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Finding the Fourth Proportional to 11,886.40, 17,824.20 and 5,309.20

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Solution

The fourth proportional to 11,886.40, 17,824.20 and 5,309.20 is: 7,961.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,886.40 : 17,824.20 = 5,309.20 : x
  2. Step 2: Convert to fraction form
    11,886.40/17,824.20 = 5,309.20/x
  3. Step 3: Cross multiply
    11,886.40x = 17,824.20 × 5,309.20
  4. Step 4: Simplify right side
    11,886.40x = 94,632,242.64
  5. Step 5: Solve for x
    x = 94,632,242.64/11,886.40
  6. Step 6: Final answer
    x = 7,961.39

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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.