Home / 1,381.39-2,072.07-1,312.18

Finding the Fourth Proportional to 1,381.39, 2,072.07 and 1,312.18

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Solution

The fourth proportional to 1,381.39, 2,072.07 and 1,312.18 is: 1,968.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.39 : 2,072.07 = 1,312.18 : x
  2. Step 2: Convert to fraction form
    1,381.39/2,072.07 = 1,312.18/x
  3. Step 3: Cross multiply
    1,381.39x = 2,072.07 × 1,312.18
  4. Step 4: Simplify right side
    1,381.39x = 2,718,928.81
  5. Step 5: Solve for x
    x = 2,718,928.81/1,381.39
  6. Step 6: Final answer
    x = 1,968.26

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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.