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Finding the Fourth Proportional to 589.90, 813.70 and 390.73

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Solution

The fourth proportional to 589.90, 813.70 and 390.73 is: 538.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.90 : 813.70 = 390.73 : x
  2. Step 2: Convert to fraction form
    589.90/813.70 = 390.73/x
  3. Step 3: Cross multiply
    589.90x = 813.70 × 390.73
  4. Step 4: Simplify right side
    589.90x = 317,937.00
  5. Step 5: Solve for x
    x = 317,937.00/589.90
  6. Step 6: Final answer
    x = 538.97

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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.