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Finding the Fourth Proportional to 489.06, 734.09 and 431.66

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Solution

The fourth proportional to 489.06, 734.09 and 431.66 is: 647.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.06 : 734.09 = 431.66 : x
  2. Step 2: Convert to fraction form
    489.06/734.09 = 431.66/x
  3. Step 3: Cross multiply
    489.06x = 734.09 × 431.66
  4. Step 4: Simplify right side
    489.06x = 316,871.46
  5. Step 5: Solve for x
    x = 316,871.46/489.06
  6. Step 6: Final answer
    x = 647.92

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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.