Home / 1,381.32-2,071.98-408.15

Finding the Fourth Proportional to 1,381.32, 2,071.98 and 408.15

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Solution

The fourth proportional to 1,381.32, 2,071.98 and 408.15 is: 612.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.32 : 2,071.98 = 408.15 : x
  2. Step 2: Convert to fraction form
    1,381.32/2,071.98 = 408.15/x
  3. Step 3: Cross multiply
    1,381.32x = 2,071.98 × 408.15
  4. Step 4: Simplify right side
    1,381.32x = 845,678.64
  5. Step 5: Solve for x
    x = 845,678.64/1,381.32
  6. Step 6: Final answer
    x = 612.23

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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.