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Finding the Fourth Proportional to 485.62, 670.36 and 345.76

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Solution

The fourth proportional to 485.62, 670.36 and 345.76 is: 477.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.62 : 670.36 = 345.76 : x
  2. Step 2: Convert to fraction form
    485.62/670.36 = 345.76/x
  3. Step 3: Cross multiply
    485.62x = 670.36 × 345.76
  4. Step 4: Simplify right side
    485.62x = 231,783.67
  5. Step 5: Solve for x
    x = 231,783.67/485.62
  6. Step 6: Final answer
    x = 477.29

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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.