Home / 1,318.15-1,977.33-393.69

Finding the Fourth Proportional to 1,318.15, 1,977.33 and 393.69

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Solution

The fourth proportional to 1,318.15, 1,977.33 and 393.69 is: 590.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.15 : 1,977.33 = 393.69 : x
  2. Step 2: Convert to fraction form
    1,318.15/1,977.33 = 393.69/x
  3. Step 3: Cross multiply
    1,318.15x = 1,977.33 × 393.69
  4. Step 4: Simplify right side
    1,318.15x = 778,455.05
  5. Step 5: Solve for x
    x = 778,455.05/1,318.15
  6. Step 6: Final answer
    x = 590.57

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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.