Home / 1,314.14-1,971.17-389.72

Finding the Fourth Proportional to 1,314.14, 1,971.17 and 389.72

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Solution

The fourth proportional to 1,314.14, 1,971.17 and 389.72 is: 584.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.14 : 1,971.17 = 389.72 : x
  2. Step 2: Convert to fraction form
    1,314.14/1,971.17 = 389.72/x
  3. Step 3: Cross multiply
    1,314.14x = 1,971.17 × 389.72
  4. Step 4: Simplify right side
    1,314.14x = 768,202.42
  5. Step 5: Solve for x
    x = 768,202.42/1,314.14
  6. Step 6: Final answer
    x = 584.57

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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.