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Finding the Fourth Proportional to 485.56, 670.64 and 438.92

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Solution

The fourth proportional to 485.56, 670.64 and 438.92 is: 606.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.56 : 670.64 = 438.92 : x
  2. Step 2: Convert to fraction form
    485.56/670.64 = 438.92/x
  3. Step 3: Cross multiply
    485.56x = 670.64 × 438.92
  4. Step 4: Simplify right side
    485.56x = 294,357.31
  5. Step 5: Solve for x
    x = 294,357.31/485.56
  6. Step 6: Final answer
    x = 606.22

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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.