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Finding the Fourth Proportional to 8,393.67, 12,590.44 and 3,128.51

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Solution

The fourth proportional to 8,393.67, 12,590.44 and 3,128.51 is: 4,692.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,393.67 : 12,590.44 = 3,128.51 : x
  2. Step 2: Convert to fraction form
    8,393.67/12,590.44 = 3,128.51/x
  3. Step 3: Cross multiply
    8,393.67x = 12,590.44 × 3,128.51
  4. Step 4: Simplify right side
    8,393.67x = 39,389,341.10
  5. Step 5: Solve for x
    x = 39,389,341.10/8,393.67
  6. Step 6: Final answer
    x = 4,692.74

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.