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Finding the Fourth Proportional to 28,776.40, 39,717.56 and 19,339.50

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Solution

The fourth proportional to 28,776.40, 39,717.56 and 19,339.50 is: 26,692.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,776.40 : 39,717.56 = 19,339.50 : x
  2. Step 2: Convert to fraction form
    28,776.40/39,717.56 = 19,339.50/x
  3. Step 3: Cross multiply
    28,776.40x = 39,717.56 × 19,339.50
  4. Step 4: Simplify right side
    28,776.40x = 768,117,751.62
  5. Step 5: Solve for x
    x = 768,117,751.62/28,776.40
  6. Step 6: Final answer
    x = 26,692.63

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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.