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Finding the Fourth Proportional to 587.75, 811.40 and 413.40

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Solution

The fourth proportional to 587.75, 811.40 and 413.40 is: 570.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.75 : 811.40 = 413.40 : x
  2. Step 2: Convert to fraction form
    587.75/811.40 = 413.40/x
  3. Step 3: Cross multiply
    587.75x = 811.40 × 413.40
  4. Step 4: Simplify right side
    587.75x = 335,432.76
  5. Step 5: Solve for x
    x = 335,432.76/587.75
  6. Step 6: Final answer
    x = 570.71

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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.