Home / 2,161.14-2,981.12-1,405.13

Finding the Fourth Proportional to 2,161.14, 2,981.12 and 1,405.13

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Solution

The fourth proportional to 2,161.14, 2,981.12 and 1,405.13 is: 1,938.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.14 : 2,981.12 = 1,405.13 : x
  2. Step 2: Convert to fraction form
    2,161.14/2,981.12 = 1,405.13/x
  3. Step 3: Cross multiply
    2,161.14x = 2,981.12 × 1,405.13
  4. Step 4: Simplify right side
    2,161.14x = 4,188,851.67
  5. Step 5: Solve for x
    x = 4,188,851.67/2,161.14
  6. Step 6: Final answer
    x = 1,938.26

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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.