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Finding the Fourth Proportional to 15,491.61, 21,373.85 and 8,777.09

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Solution

The fourth proportional to 15,491.61, 21,373.85 and 8,777.09 is: 12,109.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,491.61 : 21,373.85 = 8,777.09 : x
  2. Step 2: Convert to fraction form
    15,491.61/21,373.85 = 8,777.09/x
  3. Step 3: Cross multiply
    15,491.61x = 21,373.85 × 8,777.09
  4. Step 4: Simplify right side
    15,491.61x = 187,600,161.21
  5. Step 5: Solve for x
    x = 187,600,161.21/15,491.61
  6. Step 6: Final answer
    x = 12,109.80

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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.