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Finding the Fourth Proportional to 15,615.21, 21,549.49 and 8,541.62

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Solution

The fourth proportional to 15,615.21, 21,549.49 and 8,541.62 is: 11,787.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.21 : 21,549.49 = 8,541.62 : x
  2. Step 2: Convert to fraction form
    15,615.21/21,549.49 = 8,541.62/x
  3. Step 3: Cross multiply
    15,615.21x = 21,549.49 × 8,541.62
  4. Step 4: Simplify right side
    15,615.21x = 184,067,554.77
  5. Step 5: Solve for x
    x = 184,067,554.77/15,615.21
  6. Step 6: Final answer
    x = 11,787.71

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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.