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Finding the Fourth Proportional to 485.61, 670.16 and 275.81

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Solution

The fourth proportional to 485.61, 670.16 and 275.81 is: 380.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.61 : 670.16 = 275.81 : x
  2. Step 2: Convert to fraction form
    485.61/670.16 = 275.81/x
  3. Step 3: Cross multiply
    485.61x = 670.16 × 275.81
  4. Step 4: Simplify right side
    485.61x = 184,839.19
  5. Step 5: Solve for x
    x = 184,839.19/485.61
  6. Step 6: Final answer
    x = 380.63

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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.