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Finding the Fourth Proportional to 589.59, 813.37 and 390.37

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Solution

The fourth proportional to 589.59, 813.37 and 390.37 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.59 : 813.37 = 390.37 : x
  2. Step 2: Convert to fraction form
    589.59/813.37 = 390.37/x
  3. Step 3: Cross multiply
    589.59x = 813.37 × 390.37
  4. Step 4: Simplify right side
    589.59x = 317,515.25
  5. Step 5: Solve for x
    x = 317,515.25/589.59
  6. Step 6: Final answer
    x = 538.54

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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.