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Finding the Fourth Proportional to 14,387.92, 21,620.92 and 7,818.96

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Solution

The fourth proportional to 14,387.92, 21,620.92 and 7,818.96 is: 11,749.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,387.92 : 21,620.92 = 7,818.96 : x
  2. Step 2: Convert to fraction form
    14,387.92/21,620.92 = 7,818.96/x
  3. Step 3: Cross multiply
    14,387.92x = 21,620.92 × 7,818.96
  4. Step 4: Simplify right side
    14,387.92x = 169,053,108.64
  5. Step 5: Solve for x
    x = 169,053,108.64/14,387.92
  6. Step 6: Final answer
    x = 11,749.66

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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.