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Finding the Fourth Proportional to 12,991.77, 17,928.63 and 7,023.44

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Solution

The fourth proportional to 12,991.77, 17,928.63 and 7,023.44 is: 9,692.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.77 : 17,928.63 = 7,023.44 : x
  2. Step 2: Convert to fraction form
    12,991.77/17,928.63 = 7,023.44/x
  3. Step 3: Cross multiply
    12,991.77x = 17,928.63 × 7,023.44
  4. Step 4: Simplify right side
    12,991.77x = 125,920,567.44
  5. Step 5: Solve for x
    x = 125,920,567.44/12,991.77
  6. Step 6: Final answer
    x = 9,692.34

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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.