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Finding the Fourth Proportional to 12,991.65, 17,928.40 and 7,023.30

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Solution

The fourth proportional to 12,991.65, 17,928.40 and 7,023.30 is: 9,692.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.65 : 17,928.40 = 7,023.30 : x
  2. Step 2: Convert to fraction form
    12,991.65/17,928.40 = 7,023.30/x
  3. Step 3: Cross multiply
    12,991.65x = 17,928.40 × 7,023.30
  4. Step 4: Simplify right side
    12,991.65x = 125,916,531.72
  5. Step 5: Solve for x
    x = 125,916,531.72/12,991.65
  6. Step 6: Final answer
    x = 9,692.11

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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.