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Finding the Fourth Proportional to 1,314.53, 1,971.82 and 390.11

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Solution

The fourth proportional to 1,314.53, 1,971.82 and 390.11 is: 585.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.53 : 1,971.82 = 390.11 : x
  2. Step 2: Convert to fraction form
    1,314.53/1,971.82 = 390.11/x
  3. Step 3: Cross multiply
    1,314.53x = 1,971.82 × 390.11
  4. Step 4: Simplify right side
    1,314.53x = 769,217.33
  5. Step 5: Solve for x
    x = 769,217.33/1,314.53
  6. Step 6: Final answer
    x = 585.17

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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.