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Finding the Fourth Proportional to 19,872.79, 29,769.37 and 11,970.89

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Solution

The fourth proportional to 19,872.79, 29,769.37 and 11,970.89 is: 17,932.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,872.79 : 29,769.37 = 11,970.89 : x
  2. Step 2: Convert to fraction form
    19,872.79/29,769.37 = 11,970.89/x
  3. Step 3: Cross multiply
    19,872.79x = 29,769.37 × 11,970.89
  4. Step 4: Simplify right side
    19,872.79x = 356,365,853.84
  5. Step 5: Solve for x
    x = 356,365,853.84/19,872.79
  6. Step 6: Final answer
    x = 17,932.35

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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.