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Finding the Fourth Proportional to 734.07, 1,012.91 and 485.49

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Solution

The fourth proportional to 734.07, 1,012.91 and 485.49 is: 669.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.07 : 1,012.91 = 485.49 : x
  2. Step 2: Convert to fraction form
    734.07/1,012.91 = 485.49/x
  3. Step 3: Cross multiply
    734.07x = 1,012.91 × 485.49
  4. Step 4: Simplify right side
    734.07x = 491,755.25
  5. Step 5: Solve for x
    x = 491,755.25/734.07
  6. Step 6: Final answer
    x = 669.90

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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.