Home / 21,689.84-29,928.12-13,189.52

Finding the Fourth Proportional to 21,689.84, 29,928.12 and 13,189.52

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Solution

The fourth proportional to 21,689.84, 29,928.12 and 13,189.52 is: 18,199.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.84 : 29,928.12 = 13,189.52 : x
  2. Step 2: Convert to fraction form
    21,689.84/29,928.12 = 13,189.52/x
  3. Step 3: Cross multiply
    21,689.84x = 29,928.12 × 13,189.52
  4. Step 4: Simplify right side
    21,689.84x = 394,737,537.30
  5. Step 5: Solve for x
    x = 394,737,537.30/21,689.84
  6. Step 6: Final answer
    x = 18,199.19

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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.