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Finding the Fourth Proportional to 678.96, 936.96 and 413.32

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Solution

The fourth proportional to 678.96, 936.96 and 413.32 is: 570.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.96 : 936.96 = 413.32 : x
  2. Step 2: Convert to fraction form
    678.96/936.96 = 413.32/x
  3. Step 3: Cross multiply
    678.96x = 936.96 × 413.32
  4. Step 4: Simplify right side
    678.96x = 387,264.31
  5. Step 5: Solve for x
    x = 387,264.31/678.96
  6. Step 6: Final answer
    x = 570.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.