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Finding the Fourth Proportional to 628.40, 942.60 and 413.12

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Solution

The fourth proportional to 628.40, 942.60 and 413.12 is: 619.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.40 : 942.60 = 413.12 : x
  2. Step 2: Convert to fraction form
    628.40/942.60 = 413.12/x
  3. Step 3: Cross multiply
    628.40x = 942.60 × 413.12
  4. Step 4: Simplify right side
    628.40x = 389,406.91
  5. Step 5: Solve for x
    x = 389,406.91/628.40
  6. Step 6: Final answer
    x = 619.68

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Similar ratio
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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.