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Finding the Fourth Proportional to 485.42, 670.25 and 299.17

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Solution

The fourth proportional to 485.42, 670.25 and 299.17 is: 413.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.42 : 670.25 = 299.17 : x
  2. Step 2: Convert to fraction form
    485.42/670.25 = 299.17/x
  3. Step 3: Cross multiply
    485.42x = 670.25 × 299.17
  4. Step 4: Simplify right side
    485.42x = 200,518.69
  5. Step 5: Solve for x
    x = 200,518.69/485.42
  6. Step 6: Final answer
    x = 413.08

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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.