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Finding the Fourth Proportional to 485.68, 670.25 and 275.83

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Solution

The fourth proportional to 485.68, 670.25 and 275.83 is: 380.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.68 : 670.25 = 275.83 : x
  2. Step 2: Convert to fraction form
    485.68/670.25 = 275.83/x
  3. Step 3: Cross multiply
    485.68x = 670.25 × 275.83
  4. Step 4: Simplify right side
    485.68x = 184,875.06
  5. Step 5: Solve for x
    x = 184,875.06/485.68
  6. Step 6: Final answer
    x = 380.65

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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.