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Finding the Fourth Proportional to 1,074.50, 1,612 and 390.50

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Solution

The fourth proportional to 1,074.50, 1,612 and 390.50 is: 585.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.50 : 1,612 = 390.50 : x
  2. Step 2: Convert to fraction form
    1,074.50/1,612 = 390.50/x
  3. Step 3: Cross multiply
    1,074.50x = 1,612 × 390.50
  4. Step 4: Simplify right side
    1,074.50x = 629,486
  5. Step 5: Solve for x
    x = 629,486/1,074.50
  6. Step 6: Final answer
    x = 585.84

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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.