Home / 1,318.41-1,977.60-393.98

Finding the Fourth Proportional to 1,318.41, 1,977.60 and 393.98

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Solution

The fourth proportional to 1,318.41, 1,977.60 and 393.98 is: 590.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.41 : 1,977.60 = 393.98 : x
  2. Step 2: Convert to fraction form
    1,318.41/1,977.60 = 393.98/x
  3. Step 3: Cross multiply
    1,318.41x = 1,977.60 × 393.98
  4. Step 4: Simplify right side
    1,318.41x = 779,124.96
  5. Step 5: Solve for x
    x = 779,124.96/1,318.41
  6. Step 6: Final answer
    x = 590.96

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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.