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Finding the Fourth Proportional to 485.10, 669.51 and 308.16

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Solution

The fourth proportional to 485.10, 669.51 and 308.16 is: 425.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.10 : 669.51 = 308.16 : x
  2. Step 2: Convert to fraction form
    485.10/669.51 = 308.16/x
  3. Step 3: Cross multiply
    485.10x = 669.51 × 308.16
  4. Step 4: Simplify right side
    485.10x = 206,316.20
  5. Step 5: Solve for x
    x = 206,316.20/485.10
  6. Step 6: Final answer
    x = 425.31

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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.