Home / 1,412.12-2,118.40-438.32

Finding the Fourth Proportional to 1,412.12, 2,118.40 and 438.32

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Solution

The fourth proportional to 1,412.12, 2,118.40 and 438.32 is: 657.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.12 : 2,118.40 = 438.32 : x
  2. Step 2: Convert to fraction form
    1,412.12/2,118.40 = 438.32/x
  3. Step 3: Cross multiply
    1,412.12x = 2,118.40 × 438.32
  4. Step 4: Simplify right side
    1,412.12x = 928,537.09
  5. Step 5: Solve for x
    x = 928,537.09/1,412.12
  6. Step 6: Final answer
    x = 657.55

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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.