Home / 13,781.40-19,020.18-7,815.24

Finding the Fourth Proportional to 13,781.40, 19,020.18 and 7,815.24

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Solution

The fourth proportional to 13,781.40, 19,020.18 and 7,815.24 is: 10,786.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.40 : 19,020.18 = 7,815.24 : x
  2. Step 2: Convert to fraction form
    13,781.40/19,020.18 = 7,815.24/x
  3. Step 3: Cross multiply
    13,781.40x = 19,020.18 × 7,815.24
  4. Step 4: Simplify right side
    13,781.40x = 148,647,271.54
  5. Step 5: Solve for x
    x = 148,647,271.54/13,781.40
  6. Step 6: Final answer
    x = 10,786.08

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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.