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Finding the Fourth Proportional to 15,755.31, 21,742.02 and 8,681.58

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Solution

The fourth proportional to 15,755.31, 21,742.02 and 8,681.58 is: 11,980.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,755.31 : 21,742.02 = 8,681.58 : x
  2. Step 2: Convert to fraction form
    15,755.31/21,742.02 = 8,681.58/x
  3. Step 3: Cross multiply
    15,755.31x = 21,742.02 × 8,681.58
  4. Step 4: Simplify right side
    15,755.31x = 188,755,085.99
  5. Step 5: Solve for x
    x = 188,755,085.99/15,755.31
  6. Step 6: Final answer
    x = 11,980.41

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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.