Home / 13,739.95-18,960.80-7,690.28

Finding the Fourth Proportional to 13,739.95, 18,960.80 and 7,690.28

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Solution

The fourth proportional to 13,739.95, 18,960.80 and 7,690.28 is: 10,612.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,739.95 : 18,960.80 = 7,690.28 : x
  2. Step 2: Convert to fraction form
    13,739.95/18,960.80 = 7,690.28/x
  3. Step 3: Cross multiply
    13,739.95x = 18,960.80 × 7,690.28
  4. Step 4: Simplify right side
    13,739.95x = 145,813,771.03
  5. Step 5: Solve for x
    x = 145,813,771.03/13,739.95
  6. Step 6: Final answer
    x = 10,612.39

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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.