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Finding the Fourth Proportional to 15,687.61, 21,650.24 and 8,615.41

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Solution

The fourth proportional to 15,687.61, 21,650.24 and 8,615.41 is: 11,890.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.61 : 21,650.24 = 8,615.41 : x
  2. Step 2: Convert to fraction form
    15,687.61/21,650.24 = 8,615.41/x
  3. Step 3: Cross multiply
    15,687.61x = 21,650.24 × 8,615.41
  4. Step 4: Simplify right side
    15,687.61x = 186,525,694.20
  5. Step 5: Solve for x
    x = 186,525,694.20/15,687.61
  6. Step 6: Final answer
    x = 11,890.00

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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.