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Finding the Fourth Proportional to 21,789.40, 30,068.54 and 11,853.40

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Solution

The fourth proportional to 21,789.40, 30,068.54 and 11,853.40 is: 16,357.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,789.40 : 30,068.54 = 11,853.40 : x
  2. Step 2: Convert to fraction form
    21,789.40/30,068.54 = 11,853.40/x
  3. Step 3: Cross multiply
    21,789.40x = 30,068.54 × 11,853.40
  4. Step 4: Simplify right side
    21,789.40x = 356,414,432.04
  5. Step 5: Solve for x
    x = 356,414,432.04/21,789.40
  6. Step 6: Final answer
    x = 16,357.24

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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.