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Finding the Fourth Proportional to 15,291.86, 21,103.60 and 8,579.60

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Solution

The fourth proportional to 15,291.86, 21,103.60 and 8,579.60 is: 11,840.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,291.86 : 21,103.60 = 8,579.60 : x
  2. Step 2: Convert to fraction form
    15,291.86/21,103.60 = 8,579.60/x
  3. Step 3: Cross multiply
    15,291.86x = 21,103.60 × 8,579.60
  4. Step 4: Simplify right side
    15,291.86x = 181,060,446.56
  5. Step 5: Solve for x
    x = 181,060,446.56/15,291.86
  6. Step 6: Final answer
    x = 11,840.32

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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.