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Finding the Fourth Proportional to 15,755.63, 21,742.83 and 8,681.90

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Solution

The fourth proportional to 15,755.63, 21,742.83 and 8,681.90 is: 11,981.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,755.63 : 21,742.83 = 8,681.90 : x
  2. Step 2: Convert to fraction form
    15,755.63/21,742.83 = 8,681.90/x
  3. Step 3: Cross multiply
    15,755.63x = 21,742.83 × 8,681.90
  4. Step 4: Simplify right side
    15,755.63x = 188,768,967.06
  5. Step 5: Solve for x
    x = 188,768,967.06/15,755.63
  6. Step 6: Final answer
    x = 11,981.05

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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.