Home / 13,709.36-18,917.88-7,740.20

Finding the Fourth Proportional to 13,709.36, 18,917.88 and 7,740.20

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Solution

The fourth proportional to 13,709.36, 18,917.88 and 7,740.20 is: 10,680.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,709.36 : 18,917.88 = 7,740.20 : x
  2. Step 2: Convert to fraction form
    13,709.36/18,917.88 = 7,740.20/x
  3. Step 3: Cross multiply
    13,709.36x = 18,917.88 × 7,740.20
  4. Step 4: Simplify right side
    13,709.36x = 146,428,174.78
  5. Step 5: Solve for x
    x = 146,428,174.78/13,709.36
  6. Step 6: Final answer
    x = 10,680.89

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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.