Home / 12,585.11-18,870.30-5,181.21

Finding the Fourth Proportional to 12,585.11, 18,870.30 and 5,181.21

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Solution

The fourth proportional to 12,585.11, 18,870.30 and 5,181.21 is: 7,768.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,585.11 : 18,870.30 = 5,181.21 : x
  2. Step 2: Convert to fraction form
    12,585.11/18,870.30 = 5,181.21/x
  3. Step 3: Cross multiply
    12,585.11x = 18,870.30 × 5,181.21
  4. Step 4: Simplify right side
    12,585.11x = 97,770,987.06
  5. Step 5: Solve for x
    x = 97,770,987.06/12,585.11
  6. Step 6: Final answer
    x = 7,768.79

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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.