Home / 2,381.40-3,285.63-1,386.45

Finding the Fourth Proportional to 2,381.40, 3,285.63 and 1,386.45

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Solution

The fourth proportional to 2,381.40, 3,285.63 and 1,386.45 is: 1,912.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,381.40 : 3,285.63 = 1,386.45 : x
  2. Step 2: Convert to fraction form
    2,381.40/3,285.63 = 1,386.45/x
  3. Step 3: Cross multiply
    2,381.40x = 3,285.63 × 1,386.45
  4. Step 4: Simplify right side
    2,381.40x = 4,555,361.71
  5. Step 5: Solve for x
    x = 4,555,361.71/2,381.40
  6. Step 6: Final answer
    x = 1,912.89

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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.