Home / 2,478.42-3,420.81-1,431.09

Finding the Fourth Proportional to 2,478.42, 3,420.81 and 1,431.09

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Solution

The fourth proportional to 2,478.42, 3,420.81 and 1,431.09 is: 1,975.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,478.42 : 3,420.81 = 1,431.09 : x
  2. Step 2: Convert to fraction form
    2,478.42/3,420.81 = 1,431.09/x
  3. Step 3: Cross multiply
    2,478.42x = 3,420.81 × 1,431.09
  4. Step 4: Simplify right side
    2,478.42x = 4,895,486.98
  5. Step 5: Solve for x
    x = 4,895,486.98/2,478.42
  6. Step 6: Final answer
    x = 1,975.25

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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.