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Finding the Fourth Proportional to 15,558.32, 21,471 and 8,485.14

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Solution

The fourth proportional to 15,558.32, 21,471 and 8,485.14 is: 11,709.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,558.32 : 21,471 = 8,485.14 : x
  2. Step 2: Convert to fraction form
    15,558.32/21,471 = 8,485.14/x
  3. Step 3: Cross multiply
    15,558.32x = 21,471 × 8,485.14
  4. Step 4: Simplify right side
    15,558.32x = 182,184,440.94
  5. Step 5: Solve for x
    x = 182,184,440.94/15,558.32
  6. Step 6: Final answer
    x = 11,709.78

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Double scale
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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.