Home / 2,381.40-3,287.16-1,387.08

Finding the Fourth Proportional to 2,381.40, 3,287.16 and 1,387.08

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Solution

The fourth proportional to 2,381.40, 3,287.16 and 1,387.08 is: 1,914.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,381.40 : 3,287.16 = 1,387.08 : x
  2. Step 2: Convert to fraction form
    2,381.40/3,287.16 = 1,387.08/x
  3. Step 3: Cross multiply
    2,381.40x = 3,287.16 × 1,387.08
  4. Step 4: Simplify right side
    2,381.40x = 4,559,553.89
  5. Step 5: Solve for x
    x = 4,559,553.89/2,381.40
  6. Step 6: Final answer
    x = 1,914.65

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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.