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Finding the Fourth Proportional to 21,898.44, 30,219.12 and 12,945.78

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Solution

The fourth proportional to 21,898.44, 30,219.12 and 12,945.78 is: 17,864.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,898.44 : 30,219.12 = 12,945.78 : x
  2. Step 2: Convert to fraction form
    21,898.44/30,219.12 = 12,945.78/x
  3. Step 3: Cross multiply
    21,898.44x = 30,219.12 × 12,945.78
  4. Step 4: Simplify right side
    21,898.44x = 391,210,079.31
  5. Step 5: Solve for x
    x = 391,210,079.31/21,898.44
  6. Step 6: Final answer
    x = 17,864.75

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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.