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Finding the Fourth Proportional to 8,643.68, 11,922 and 5,991.20

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Solution

The fourth proportional to 8,643.68, 11,922 and 5,991.20 is: 8,263.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,643.68 : 11,922 = 5,991.20 : x
  2. Step 2: Convert to fraction form
    8,643.68/11,922 = 5,991.20/x
  3. Step 3: Cross multiply
    8,643.68x = 11,922 × 5,991.20
  4. Step 4: Simplify right side
    8,643.68x = 71,427,086.40
  5. Step 5: Solve for x
    x = 71,427,086.40/8,643.68
  6. Step 6: Final answer
    x = 8,263.50

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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.