Home / 15,758.36-21,777.88-12,921.33

Finding the Fourth Proportional to 15,758.36, 21,777.88 and 12,921.33

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Solution

The fourth proportional to 15,758.36, 21,777.88 and 12,921.33 is: 17,857.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,758.36 : 21,777.88 = 12,921.33 : x
  2. Step 2: Convert to fraction form
    15,758.36/21,777.88 = 12,921.33/x
  3. Step 3: Cross multiply
    15,758.36x = 21,777.88 × 12,921.33
  4. Step 4: Simplify right side
    15,758.36x = 281,399,174.18
  5. Step 5: Solve for x
    x = 281,399,174.18/15,758.36
  6. Step 6: Final answer
    x = 17,857.14

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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.