Home / 3,129.12-4,317.84-1,731.78

Finding the Fourth Proportional to 3,129.12, 4,317.84 and 1,731.78

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Solution

The fourth proportional to 3,129.12, 4,317.84 and 1,731.78 is: 2,389.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.12 : 4,317.84 = 1,731.78 : x
  2. Step 2: Convert to fraction form
    3,129.12/4,317.84 = 1,731.78/x
  3. Step 3: Cross multiply
    3,129.12x = 4,317.84 × 1,731.78
  4. Step 4: Simplify right side
    3,129.12x = 7,477,548.96
  5. Step 5: Solve for x
    x = 7,477,548.96/3,129.12
  6. Step 6: Final answer
    x = 2,389.67

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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.