Home / 15,745.46-21,729.29-9,780.39

Finding the Fourth Proportional to 15,745.46, 21,729.29 and 9,780.39

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Solution

The fourth proportional to 15,745.46, 21,729.29 and 9,780.39 is: 13,497.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,745.46 : 21,729.29 = 9,780.39 : x
  2. Step 2: Convert to fraction form
    15,745.46/21,729.29 = 9,780.39/x
  3. Step 3: Cross multiply
    15,745.46x = 21,729.29 × 9,780.39
  4. Step 4: Simplify right side
    15,745.46x = 212,520,881.72
  5. Step 5: Solve for x
    x = 212,520,881.72/15,745.46
  6. Step 6: Final answer
    x = 13,497.28

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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.