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Finding the Fourth Proportional to 485.02, 669.50 and 319.69

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Solution

The fourth proportional to 485.02, 669.50 and 319.69 is: 441.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.02 : 669.50 = 319.69 : x
  2. Step 2: Convert to fraction form
    485.02/669.50 = 319.69/x
  3. Step 3: Cross multiply
    485.02x = 669.50 × 319.69
  4. Step 4: Simplify right side
    485.02x = 214,032.46
  5. Step 5: Solve for x
    x = 214,032.46/485.02
  6. Step 6: Final answer
    x = 441.29

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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.