Home / 21,817.40-30,107.58-12,865.28

Finding the Fourth Proportional to 21,817.40, 30,107.58 and 12,865.28

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Solution

The fourth proportional to 21,817.40, 30,107.58 and 12,865.28 is: 17,753.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,817.40 : 30,107.58 = 12,865.28 : x
  2. Step 2: Convert to fraction form
    21,817.40/30,107.58 = 12,865.28/x
  3. Step 3: Cross multiply
    21,817.40x = 30,107.58 × 12,865.28
  4. Step 4: Simplify right side
    21,817.40x = 387,342,446.82
  5. Step 5: Solve for x
    x = 387,342,446.82/21,817.40
  6. Step 6: Final answer
    x = 17,753.83

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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.