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Finding the Fourth Proportional to 759.49, 1,139.55 and 413.06

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Solution

The fourth proportional to 759.49, 1,139.55 and 413.06 is: 619.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.49 : 1,139.55 = 413.06 : x
  2. Step 2: Convert to fraction form
    759.49/1,139.55 = 413.06/x
  3. Step 3: Cross multiply
    759.49x = 1,139.55 × 413.06
  4. Step 4: Simplify right side
    759.49x = 470,705.37
  5. Step 5: Solve for x
    x = 470,705.37/759.49
  6. Step 6: Final answer
    x = 619.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.