Home / 1,318.10-1,977.35-393.55

Finding the Fourth Proportional to 1,318.10, 1,977.35 and 393.55

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Solution

The fourth proportional to 1,318.10, 1,977.35 and 393.55 is: 590.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.10 : 1,977.35 = 393.55 : x
  2. Step 2: Convert to fraction form
    1,318.10/1,977.35 = 393.55/x
  3. Step 3: Cross multiply
    1,318.10x = 1,977.35 × 393.55
  4. Step 4: Simplify right side
    1,318.10x = 778,179.18
  5. Step 5: Solve for x
    x = 778,179.18/1,318.10
  6. Step 6: Final answer
    x = 590.38

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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.