Home / 13,115.81-19,675.89-5,218.40

Finding the Fourth Proportional to 13,115.81, 19,675.89 and 5,218.40

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Solution

The fourth proportional to 13,115.81, 19,675.89 and 5,218.40 is: 7,828.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,115.81 : 19,675.89 = 5,218.40 : x
  2. Step 2: Convert to fraction form
    13,115.81/19,675.89 = 5,218.40/x
  3. Step 3: Cross multiply
    13,115.81x = 19,675.89 × 5,218.40
  4. Step 4: Simplify right side
    13,115.81x = 102,676,713.57
  5. Step 5: Solve for x
    x = 102,676,713.57/13,115.81
  6. Step 6: Final answer
    x = 7,828.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.