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Finding the Fourth Proportional to 485.50, 670.03 and 275.68

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Solution

The fourth proportional to 485.50, 670.03 and 275.68 is: 380.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.50 : 670.03 = 275.68 : x
  2. Step 2: Convert to fraction form
    485.50/670.03 = 275.68/x
  3. Step 3: Cross multiply
    485.50x = 670.03 × 275.68
  4. Step 4: Simplify right side
    485.50x = 184,711.51
  5. Step 5: Solve for x
    x = 184,711.51/485.50
  6. Step 6: Final answer
    x = 380.46

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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.