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Finding the Fourth Proportional to 413.12, 569.76 and 320.96

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Solution

The fourth proportional to 413.12, 569.76 and 320.96 is: 442.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.12 : 569.76 = 320.96 : x
  2. Step 2: Convert to fraction form
    413.12/569.76 = 320.96/x
  3. Step 3: Cross multiply
    413.12x = 569.76 × 320.96
  4. Step 4: Simplify right side
    413.12x = 182,870.17
  5. Step 5: Solve for x
    x = 182,870.17/413.12
  6. Step 6: Final answer
    x = 442.66

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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.