Home / 12,928.39-19,391.50-5,135.11

Finding the Fourth Proportional to 12,928.39, 19,391.50 and 5,135.11

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Solution

The fourth proportional to 12,928.39, 19,391.50 and 5,135.11 is: 7,702.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,928.39 : 19,391.50 = 5,135.11 : x
  2. Step 2: Convert to fraction form
    12,928.39/19,391.50 = 5,135.11/x
  3. Step 3: Cross multiply
    12,928.39x = 19,391.50 × 5,135.11
  4. Step 4: Simplify right side
    12,928.39x = 99,577,485.57
  5. Step 5: Solve for x
    x = 99,577,485.57/12,928.39
  6. Step 6: Final answer
    x = 7,702.23

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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.