Home / 1,314.97-1,971.85-390.20

Finding the Fourth Proportional to 1,314.97, 1,971.85 and 390.20

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Solution

The fourth proportional to 1,314.97, 1,971.85 and 390.20 is: 585.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.97 : 1,971.85 = 390.20 : x
  2. Step 2: Convert to fraction form
    1,314.97/1,971.85 = 390.20/x
  3. Step 3: Cross multiply
    1,314.97x = 1,971.85 × 390.20
  4. Step 4: Simplify right side
    1,314.97x = 769,415.87
  5. Step 5: Solve for x
    x = 769,415.87/1,314.97
  6. Step 6: Final answer
    x = 585.12

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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.