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Finding the Fourth Proportional to 489.78, 734.17 and 307.30

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Solution

The fourth proportional to 489.78, 734.17 and 307.30 is: 460.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.78 : 734.17 = 307.30 : x
  2. Step 2: Convert to fraction form
    489.78/734.17 = 307.30/x
  3. Step 3: Cross multiply
    489.78x = 734.17 × 307.30
  4. Step 4: Simplify right side
    489.78x = 225,607.84
  5. Step 5: Solve for x
    x = 225,607.84/489.78
  6. Step 6: Final answer
    x = 460.63

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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.