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Finding the Fourth Proportional to 1,314.68, 1,972.38 and 390.22

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Solution

The fourth proportional to 1,314.68, 1,972.38 and 390.22 is: 585.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.68 : 1,972.38 = 390.22 : x
  2. Step 2: Convert to fraction form
    1,314.68/1,972.38 = 390.22/x
  3. Step 3: Cross multiply
    1,314.68x = 1,972.38 × 390.22
  4. Step 4: Simplify right side
    1,314.68x = 769,662.12
  5. Step 5: Solve for x
    x = 769,662.12/1,314.68
  6. Step 6: Final answer
    x = 585.44

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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.