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Finding the Fourth Proportional to 590.30, 813.77 and 393.74

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Solution

The fourth proportional to 590.30, 813.77 and 393.74 is: 542.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.30 : 813.77 = 393.74 : x
  2. Step 2: Convert to fraction form
    590.30/813.77 = 393.74/x
  3. Step 3: Cross multiply
    590.30x = 813.77 × 393.74
  4. Step 4: Simplify right side
    590.30x = 320,413.80
  5. Step 5: Solve for x
    x = 320,413.80/590.30
  6. Step 6: Final answer
    x = 542.80

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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.