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Finding the Fourth Proportional to 15,636.82, 21,580.86 and 8,920.90

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Solution

The fourth proportional to 15,636.82, 21,580.86 and 8,920.90 is: 12,312.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,636.82 : 21,580.86 = 8,920.90 : x
  2. Step 2: Convert to fraction form
    15,636.82/21,580.86 = 8,920.90/x
  3. Step 3: Cross multiply
    15,636.82x = 21,580.86 × 8,920.90
  4. Step 4: Simplify right side
    15,636.82x = 192,520,693.97
  5. Step 5: Solve for x
    x = 192,520,693.97/15,636.82
  6. Step 6: Final answer
    x = 12,312.01

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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.