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Finding the Fourth Proportional to 15,755.40, 21,741.89 and 8,681.85

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Solution

The fourth proportional to 15,755.40, 21,741.89 and 8,681.85 is: 11,980.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,755.40 : 21,741.89 = 8,681.85 : x
  2. Step 2: Convert to fraction form
    15,755.40/21,741.89 = 8,681.85/x
  3. Step 3: Cross multiply
    15,755.40x = 21,741.89 × 8,681.85
  4. Step 4: Simplify right side
    15,755.40x = 188,759,784.29
  5. Step 5: Solve for x
    x = 188,759,784.29/15,755.40
  6. Step 6: Final answer
    x = 11,980.64

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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.