Home / 20,710.72-28,563.90-12,738.64

Finding the Fourth Proportional to 20,710.72, 28,563.90 and 12,738.64

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Solution

The fourth proportional to 20,710.72, 28,563.90 and 12,738.64 is: 17,568.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.72 : 28,563.90 = 12,738.64 : x
  2. Step 2: Convert to fraction form
    20,710.72/28,563.90 = 12,738.64/x
  3. Step 3: Cross multiply
    20,710.72x = 28,563.90 × 12,738.64
  4. Step 4: Simplify right side
    20,710.72x = 363,865,239.10
  5. Step 5: Solve for x
    x = 363,865,239.10/20,710.72
  6. Step 6: Final answer
    x = 17,568.93

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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.