Home / 13,749.81-18,975.02-7,781.48

Finding the Fourth Proportional to 13,749.81, 18,975.02 and 7,781.48

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Solution

The fourth proportional to 13,749.81, 18,975.02 and 7,781.48 is: 10,738.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.81 : 18,975.02 = 7,781.48 : x
  2. Step 2: Convert to fraction form
    13,749.81/18,975.02 = 7,781.48/x
  3. Step 3: Cross multiply
    13,749.81x = 18,975.02 × 7,781.48
  4. Step 4: Simplify right side
    13,749.81x = 147,653,604.85
  5. Step 5: Solve for x
    x = 147,653,604.85/13,749.81
  6. Step 6: Final answer
    x = 10,738.60

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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.