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Finding the Fourth Proportional to 20,702.78, 28,575.29 and 12,751.67

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Solution

The fourth proportional to 20,702.78, 28,575.29 and 12,751.67 is: 17,600.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,702.78 : 28,575.29 = 12,751.67 : x
  2. Step 2: Convert to fraction form
    20,702.78/28,575.29 = 12,751.67/x
  3. Step 3: Cross multiply
    20,702.78x = 28,575.29 × 12,751.67
  4. Step 4: Simplify right side
    20,702.78x = 364,382,668.23
  5. Step 5: Solve for x
    x = 364,382,668.23/20,702.78
  6. Step 6: Final answer
    x = 17,600.66

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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.