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Finding the Fourth Proportional to 15,487.79, 21,372.98 and 8,771.87

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Solution

The fourth proportional to 15,487.79, 21,372.98 and 8,771.87 is: 12,105.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,487.79 : 21,372.98 = 8,771.87 : x
  2. Step 2: Convert to fraction form
    15,487.79/21,372.98 = 8,771.87/x
  3. Step 3: Cross multiply
    15,487.79x = 21,372.98 × 8,771.87
  4. Step 4: Simplify right side
    15,487.79x = 187,481,011.65
  5. Step 5: Solve for x
    x = 187,481,011.65/15,487.79
  6. Step 6: Final answer
    x = 12,105.09

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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.