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Finding the Fourth Proportional to 17,979.60, 26,969.40 and 15,128.40

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Solution

The fourth proportional to 17,979.60, 26,969.40 and 15,128.40 is: 22,692.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,979.60 : 26,969.40 = 15,128.40 : x
  2. Step 2: Convert to fraction form
    17,979.60/26,969.40 = 15,128.40/x
  3. Step 3: Cross multiply
    17,979.60x = 26,969.40 × 15,128.40
  4. Step 4: Simplify right side
    17,979.60x = 408,003,870.96
  5. Step 5: Solve for x
    x = 408,003,870.96/17,979.60
  6. Step 6: Final answer
    x = 22,692.60

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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.