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Finding the Fourth Proportional to 998.21, 1,496.88 and 413.12

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Solution

The fourth proportional to 998.21, 1,496.88 and 413.12 is: 619.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.21 : 1,496.88 = 413.12 : x
  2. Step 2: Convert to fraction form
    998.21/1,496.88 = 413.12/x
  3. Step 3: Cross multiply
    998.21x = 1,496.88 × 413.12
  4. Step 4: Simplify right side
    998.21x = 618,394.81
  5. Step 5: Solve for x
    x = 618,394.81/998.21
  6. Step 6: Final answer
    x = 619.50

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Double scale
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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.