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Finding the Fourth Proportional to 15,655.21, 21,603.85 and 8,581.48

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Solution

The fourth proportional to 15,655.21, 21,603.85 and 8,581.48 is: 11,842.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,655.21 : 21,603.85 = 8,581.48 : x
  2. Step 2: Convert to fraction form
    15,655.21/21,603.85 = 8,581.48/x
  3. Step 3: Cross multiply
    15,655.21x = 21,603.85 × 8,581.48
  4. Step 4: Simplify right side
    15,655.21x = 185,393,006.70
  5. Step 5: Solve for x
    x = 185,393,006.70/15,655.21
  6. Step 6: Final answer
    x = 11,842.26

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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.