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Finding the Fourth Proportional to 485.58, 669.63 and 392.26

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Solution

The fourth proportional to 485.58, 669.63 and 392.26 is: 540.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.58 : 669.63 = 392.26 : x
  2. Step 2: Convert to fraction form
    485.58/669.63 = 392.26/x
  3. Step 3: Cross multiply
    485.58x = 669.63 × 392.26
  4. Step 4: Simplify right side
    485.58x = 262,669.06
  5. Step 5: Solve for x
    x = 262,669.06/485.58
  6. Step 6: Final answer
    x = 540.94

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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.