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Finding the Fourth Proportional to 15,745.53, 21,728.79 and 8,671.89

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Solution

The fourth proportional to 15,745.53, 21,728.79 and 8,671.89 is: 11,967.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,745.53 : 21,728.79 = 8,671.89 : x
  2. Step 2: Convert to fraction form
    15,745.53/21,728.79 = 8,671.89/x
  3. Step 3: Cross multiply
    15,745.53x = 21,728.79 × 8,671.89
  4. Step 4: Simplify right side
    15,745.53x = 188,429,676.71
  5. Step 5: Solve for x
    x = 188,429,676.71/15,745.53
  6. Step 6: Final answer
    x = 11,967.19

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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.