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Finding the Fourth Proportional to 485.78, 670.27 and 275.88

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Solution

The fourth proportional to 485.78, 670.27 and 275.88 is: 380.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.78 : 670.27 = 275.88 : x
  2. Step 2: Convert to fraction form
    485.78/670.27 = 275.88/x
  3. Step 3: Cross multiply
    485.78x = 670.27 × 275.88
  4. Step 4: Simplify right side
    485.78x = 184,913.40
  5. Step 5: Solve for x
    x = 184,913.40/485.78
  6. Step 6: Final answer
    x = 380.66

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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.