Home / 21,186.21-31,903.22-15,678.42

Finding the Fourth Proportional to 21,186.21, 31,903.22 and 15,678.42

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Solution

The fourth proportional to 21,186.21, 31,903.22 and 15,678.42 is: 23,609.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.21 : 31,903.22 = 15,678.42 : x
  2. Step 2: Convert to fraction form
    21,186.21/31,903.22 = 15,678.42/x
  3. Step 3: Cross multiply
    21,186.21x = 31,903.22 × 15,678.42
  4. Step 4: Simplify right side
    21,186.21x = 500,192,082.51
  5. Step 5: Solve for x
    x = 500,192,082.51/21,186.21
  6. Step 6: Final answer
    x = 23,609.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.