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Finding the Fourth Proportional to 670.29, 1,003.91 and 485.79

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Solution

The fourth proportional to 670.29, 1,003.91 and 485.79 is: 727.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.29 : 1,003.91 = 485.79 : x
  2. Step 2: Convert to fraction form
    670.29/1,003.91 = 485.79/x
  3. Step 3: Cross multiply
    670.29x = 1,003.91 × 485.79
  4. Step 4: Simplify right side
    670.29x = 487,687.01
  5. Step 5: Solve for x
    x = 487,687.01/670.29
  6. Step 6: Final answer
    x = 727.58

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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.