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Finding the Fourth Proportional to 15,495.86, 21,389.22 and 9,906.86

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Solution

The fourth proportional to 15,495.86, 21,389.22 and 9,906.86 is: 13,674.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495.86 : 21,389.22 = 9,906.86 : x
  2. Step 2: Convert to fraction form
    15,495.86/21,389.22 = 9,906.86/x
  3. Step 3: Cross multiply
    15,495.86x = 21,389.22 × 9,906.86
  4. Step 4: Simplify right side
    15,495.86x = 211,900,008.05
  5. Step 5: Solve for x
    x = 211,900,008.05/15,495.86
  6. Step 6: Final answer
    x = 13,674.62

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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.