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Finding the Fourth Proportional to 15,655.71, 21,604.55 and 8,581.98

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Solution

The fourth proportional to 15,655.71, 21,604.55 and 8,581.98 is: 11,842.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,655.71 : 21,604.55 = 8,581.98 : x
  2. Step 2: Convert to fraction form
    15,655.71/21,604.55 = 8,581.98/x
  3. Step 3: Cross multiply
    15,655.71x = 21,604.55 × 8,581.98
  4. Step 4: Simplify right side
    15,655.71x = 185,409,773.10
  5. Step 5: Solve for x
    x = 185,409,773.10/15,655.71
  6. Step 6: Final answer
    x = 11,842.95

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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.