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Finding the Fourth Proportional to 19,681.80, 29,529.90 and 18,961.80

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Solution

The fourth proportional to 19,681.80, 29,529.90 and 18,961.80 is: 28,449.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,681.80 : 29,529.90 = 18,961.80 : x
  2. Step 2: Convert to fraction form
    19,681.80/29,529.90 = 18,961.80/x
  3. Step 3: Cross multiply
    19,681.80x = 29,529.90 × 18,961.80
  4. Step 4: Simplify right side
    19,681.80x = 559,940,057.82
  5. Step 5: Solve for x
    x = 559,940,057.82/19,681.80
  6. Step 6: Final answer
    x = 28,449.64

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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.