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Finding the Fourth Proportional to 485.70, 669.36 and 361.16

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Solution

The fourth proportional to 485.70, 669.36 and 361.16 is: 497.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.70 : 669.36 = 361.16 : x
  2. Step 2: Convert to fraction form
    485.70/669.36 = 361.16/x
  3. Step 3: Cross multiply
    485.70x = 669.36 × 361.16
  4. Step 4: Simplify right side
    485.70x = 241,746.06
  5. Step 5: Solve for x
    x = 241,746.06/485.70
  6. Step 6: Final answer
    x = 497.73

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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.