Home / 1,390.21-1,916.70-1,168.67

Finding the Fourth Proportional to 1,390.21, 1,916.70 and 1,168.67

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Solution

The fourth proportional to 1,390.21, 1,916.70 and 1,168.67 is: 1,611.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.21 : 1,916.70 = 1,168.67 : x
  2. Step 2: Convert to fraction form
    1,390.21/1,916.70 = 1,168.67/x
  3. Step 3: Cross multiply
    1,390.21x = 1,916.70 × 1,168.67
  4. Step 4: Simplify right side
    1,390.21x = 2,239,989.79
  5. Step 5: Solve for x
    x = 2,239,989.79/1,390.21
  6. Step 6: Final answer
    x = 1,611.26

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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.