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Finding the Fourth Proportional to 1,412.99, 2,120.43 and 580.74

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Solution

The fourth proportional to 1,412.99, 2,120.43 and 580.74 is: 871.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.99 : 2,120.43 = 580.74 : x
  2. Step 2: Convert to fraction form
    1,412.99/2,120.43 = 580.74/x
  3. Step 3: Cross multiply
    1,412.99x = 2,120.43 × 580.74
  4. Step 4: Simplify right side
    1,412.99x = 1,231,413.22
  5. Step 5: Solve for x
    x = 1,231,413.22/1,412.99
  6. Step 6: Final answer
    x = 871.49

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1.5x scale

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.