Home / 13,749.79-18,974.54-7,781.30

Finding the Fourth Proportional to 13,749.79, 18,974.54 and 7,781.30

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Solution

The fourth proportional to 13,749.79, 18,974.54 and 7,781.30 is: 10,738.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.79 : 18,974.54 = 7,781.30 : x
  2. Step 2: Convert to fraction form
    13,749.79/18,974.54 = 7,781.30/x
  3. Step 3: Cross multiply
    13,749.79x = 18,974.54 × 7,781.30
  4. Step 4: Simplify right side
    13,749.79x = 147,646,588.10
  5. Step 5: Solve for x
    x = 147,646,588.10/13,749.79
  6. Step 6: Final answer
    x = 10,738.10

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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.