Home / 1,314.81-1,972.19-390.37

Finding the Fourth Proportional to 1,314.81, 1,972.19 and 390.37

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Solution

The fourth proportional to 1,314.81, 1,972.19 and 390.37 is: 585.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.81 : 1,972.19 = 390.37 : x
  2. Step 2: Convert to fraction form
    1,314.81/1,972.19 = 390.37/x
  3. Step 3: Cross multiply
    1,314.81x = 1,972.19 × 390.37
  4. Step 4: Simplify right side
    1,314.81x = 769,883.81
  5. Step 5: Solve for x
    x = 769,883.81/1,314.81
  6. Step 6: Final answer
    x = 585.55

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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.