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Finding the Fourth Proportional to 485.74, 669.86 and 319.88

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Solution

The fourth proportional to 485.74, 669.86 and 319.88 is: 441.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.74 : 669.86 = 319.88 : x
  2. Step 2: Convert to fraction form
    485.74/669.86 = 319.88/x
  3. Step 3: Cross multiply
    485.74x = 669.86 × 319.88
  4. Step 4: Simplify right side
    485.74x = 214,274.82
  5. Step 5: Solve for x
    x = 214,274.82/485.74
  6. Step 6: Final answer
    x = 441.13

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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.