Home / 1,438.12-2,157.20-412.12

Finding the Fourth Proportional to 1,438.12, 2,157.20 and 412.12

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Solution

The fourth proportional to 1,438.12, 2,157.20 and 412.12 is: 618.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.12 : 2,157.20 = 412.12 : x
  2. Step 2: Convert to fraction form
    1,438.12/2,157.20 = 412.12/x
  3. Step 3: Cross multiply
    1,438.12x = 2,157.20 × 412.12
  4. Step 4: Simplify right side
    1,438.12x = 889,025.26
  5. Step 5: Solve for x
    x = 889,025.26/1,438.12
  6. Step 6: Final answer
    x = 618.19

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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.