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Finding the Fourth Proportional to 489.42, 734.34 and 478.92

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Solution

The fourth proportional to 489.42, 734.34 and 478.92 is: 718.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.42 : 734.34 = 478.92 : x
  2. Step 2: Convert to fraction form
    489.42/734.34 = 478.92/x
  3. Step 3: Cross multiply
    489.42x = 734.34 × 478.92
  4. Step 4: Simplify right side
    489.42x = 351,690.11
  5. Step 5: Solve for x
    x = 351,690.11/489.42
  6. Step 6: Final answer
    x = 718.59

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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.