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Finding the Fourth Proportional to 15,357.81, 21,194.47 and 8,643.88

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Solution

The fourth proportional to 15,357.81, 21,194.47 and 8,643.88 is: 11,928.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,357.81 : 21,194.47 = 8,643.88 : x
  2. Step 2: Convert to fraction form
    15,357.81/21,194.47 = 8,643.88/x
  3. Step 3: Cross multiply
    15,357.81x = 21,194.47 × 8,643.88
  4. Step 4: Simplify right side
    15,357.81x = 183,202,324.80
  5. Step 5: Solve for x
    x = 183,202,324.80/15,357.81
  6. Step 6: Final answer
    x = 11,928.93

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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.