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Finding the Fourth Proportional to 15,920.84, 21,971.87 and 8,847.72

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Solution

The fourth proportional to 15,920.84, 21,971.87 and 8,847.72 is: 12,210.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,920.84 : 21,971.87 = 8,847.72 : x
  2. Step 2: Convert to fraction form
    15,920.84/21,971.87 = 8,847.72/x
  3. Step 3: Cross multiply
    15,920.84x = 21,971.87 × 8,847.72
  4. Step 4: Simplify right side
    15,920.84x = 194,400,992.35
  5. Step 5: Solve for x
    x = 194,400,992.35/15,920.84
  6. Step 6: Final answer
    x = 12,210.47

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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.