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Finding the Fourth Proportional to 665.55, 998.69 and 275.59

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Solution

The fourth proportional to 665.55, 998.69 and 275.59 is: 413.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.55 : 998.69 = 275.59 : x
  2. Step 2: Convert to fraction form
    665.55/998.69 = 275.59/x
  3. Step 3: Cross multiply
    665.55x = 998.69 × 275.59
  4. Step 4: Simplify right side
    665.55x = 275,225.17
  5. Step 5: Solve for x
    x = 275,225.17/665.55
  6. Step 6: Final answer
    x = 413.53

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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.