Home / 13,858.40-19,119.04-7,807.20

Finding the Fourth Proportional to 13,858.40, 19,119.04 and 7,807.20

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Solution

The fourth proportional to 13,858.40, 19,119.04 and 7,807.20 is: 10,770.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,858.40 : 19,119.04 = 7,807.20 : x
  2. Step 2: Convert to fraction form
    13,858.40/19,119.04 = 7,807.20/x
  3. Step 3: Cross multiply
    13,858.40x = 19,119.04 × 7,807.20
  4. Step 4: Simplify right side
    13,858.40x = 149,266,169.09
  5. Step 5: Solve for x
    x = 149,266,169.09/13,858.40
  6. Step 6: Final answer
    x = 10,770.81

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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.