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Finding the Fourth Proportional to 489.80, 734.64 and 143.18

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Solution

The fourth proportional to 489.80, 734.64 and 143.18 is: 214.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.80 : 734.64 = 143.18 : x
  2. Step 2: Convert to fraction form
    489.80/734.64 = 143.18/x
  3. Step 3: Cross multiply
    489.80x = 734.64 × 143.18
  4. Step 4: Simplify right side
    489.80x = 105,185.76
  5. Step 5: Solve for x
    x = 105,185.76/489.80
  6. Step 6: Final answer
    x = 214.75

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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.