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Finding the Fourth Proportional to 485.76, 670.68 and 375

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Solution

The fourth proportional to 485.76, 670.68 and 375 is: 517.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.76 : 670.68 = 375 : x
  2. Step 2: Convert to fraction form
    485.76/670.68 = 375/x
  3. Step 3: Cross multiply
    485.76x = 670.68 × 375
  4. Step 4: Simplify right side
    485.76x = 251,505.00
  5. Step 5: Solve for x
    x = 251,505.00/485.76
  6. Step 6: Final answer
    x = 517.76

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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.