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Finding the Fourth Proportional to 19,838.80, 29,725.80 and 18,672.40

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Solution

The fourth proportional to 19,838.80, 29,725.80 and 18,672.40 is: 27,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,838.80 : 29,725.80 = 18,672.40 : x
  2. Step 2: Convert to fraction form
    19,838.80/29,725.80 = 18,672.40/x
  3. Step 3: Cross multiply
    19,838.80x = 29,725.80 × 18,672.40
  4. Step 4: Simplify right side
    19,838.80x = 555,052,027.92
  5. Step 5: Solve for x
    x = 555,052,027.92/19,838.80
  6. Step 6: Final answer
    x = 27,978.10

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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.