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Finding the Fourth Proportional to 760.78, 1,138.69 and 413.25

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Solution

The fourth proportional to 760.78, 1,138.69 and 413.25 is: 618.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.78 : 1,138.69 = 413.25 : x
  2. Step 2: Convert to fraction form
    760.78/1,138.69 = 413.25/x
  3. Step 3: Cross multiply
    760.78x = 1,138.69 × 413.25
  4. Step 4: Simplify right side
    760.78x = 470,566.29
  5. Step 5: Solve for x
    x = 470,566.29/760.78
  6. Step 6: Final answer
    x = 618.53

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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.