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Finding the Fourth Proportional to 589.27, 813.79 and 485.39

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Solution

The fourth proportional to 589.27, 813.79 and 485.39 is: 670.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.27 : 813.79 = 485.39 : x
  2. Step 2: Convert to fraction form
    589.27/813.79 = 485.39/x
  3. Step 3: Cross multiply
    589.27x = 813.79 × 485.39
  4. Step 4: Simplify right side
    589.27x = 395,004.31
  5. Step 5: Solve for x
    x = 395,004.31/589.27
  6. Step 6: Final answer
    x = 670.33

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1.5x scale

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.