Home / 28,128.72-38,817.24-15,553.20

Finding the Fourth Proportional to 28,128.72, 38,817.24 and 15,553.20

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Solution

The fourth proportional to 28,128.72, 38,817.24 and 15,553.20 is: 21,463.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,128.72 : 38,817.24 = 15,553.20 : x
  2. Step 2: Convert to fraction form
    28,128.72/38,817.24 = 15,553.20/x
  3. Step 3: Cross multiply
    28,128.72x = 38,817.24 × 15,553.20
  4. Step 4: Simplify right side
    28,128.72x = 603,732,297.17
  5. Step 5: Solve for x
    x = 603,732,297.17/28,128.72
  6. Step 6: Final answer
    x = 21,463.20

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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.