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Finding the Fourth Proportional to 1,314.87, 1,972.64 and 390.42

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Solution

The fourth proportional to 1,314.87, 1,972.64 and 390.42 is: 585.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.87 : 1,972.64 = 390.42 : x
  2. Step 2: Convert to fraction form
    1,314.87/1,972.64 = 390.42/x
  3. Step 3: Cross multiply
    1,314.87x = 1,972.64 × 390.42
  4. Step 4: Simplify right side
    1,314.87x = 770,159.08
  5. Step 5: Solve for x
    x = 770,159.08/1,314.87
  6. Step 6: Final answer
    x = 585.73

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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.