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Finding the Fourth Proportional to 15,581.95, 21,502.26 and 8,506.99

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Solution

The fourth proportional to 15,581.95, 21,502.26 and 8,506.99 is: 11,739.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,581.95 : 21,502.26 = 8,506.99 : x
  2. Step 2: Convert to fraction form
    15,581.95/21,502.26 = 8,506.99/x
  3. Step 3: Cross multiply
    15,581.95x = 21,502.26 × 8,506.99
  4. Step 4: Simplify right side
    15,581.95x = 182,919,510.80
  5. Step 5: Solve for x
    x = 182,919,510.80/15,581.95
  6. Step 6: Final answer
    x = 11,739.19

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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.