Home / 21,390.40-29,517.78-11,830.38

Finding the Fourth Proportional to 21,390.40, 29,517.78 and 11,830.38

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Solution

The fourth proportional to 21,390.40, 29,517.78 and 11,830.38 is: 16,325.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.40 : 29,517.78 = 11,830.38 : x
  2. Step 2: Convert to fraction form
    21,390.40/29,517.78 = 11,830.38/x
  3. Step 3: Cross multiply
    21,390.40x = 29,517.78 × 11,830.38
  4. Step 4: Simplify right side
    21,390.40x = 349,206,554.16
  5. Step 5: Solve for x
    x = 349,206,554.16/21,390.40
  6. Step 6: Final answer
    x = 16,325.39

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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.