Home / 1,381.09-2,071.70-407.20

Finding the Fourth Proportional to 1,381.09, 2,071.70 and 407.20

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Solution

The fourth proportional to 1,381.09, 2,071.70 and 407.20 is: 610.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.09 : 2,071.70 = 407.20 : x
  2. Step 2: Convert to fraction form
    1,381.09/2,071.70 = 407.20/x
  3. Step 3: Cross multiply
    1,381.09x = 2,071.70 × 407.20
  4. Step 4: Simplify right side
    1,381.09x = 843,596.24
  5. Step 5: Solve for x
    x = 843,596.24/1,381.09
  6. Step 6: Final answer
    x = 610.82

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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.