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Finding the Fourth Proportional to 638,208.80, 957,313.20 and 389,376.80

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Solution

The fourth proportional to 638,208.80, 957,313.20 and 389,376.80 is: 584,065.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,208.80 : 957,313.20 = 389,376.80 : x
  2. Step 2: Convert to fraction form
    638,208.80/957,313.20 = 389,376.80/x
  3. Step 3: Cross multiply
    638,208.80x = 957,313.20 × 389,376.80
  4. Step 4: Simplify right side
    638,208.80x = 372,755,550,413.76
  5. Step 5: Solve for x
    x = 372,755,550,413.76/638,208.80
  6. Step 6: Final answer
    x = 584,065.20

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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.