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Finding the Fourth Proportional to 761.99, 1,143.18 and 275.45

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Solution

The fourth proportional to 761.99, 1,143.18 and 275.45 is: 413.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.99 : 1,143.18 = 275.45 : x
  2. Step 2: Convert to fraction form
    761.99/1,143.18 = 275.45/x
  3. Step 3: Cross multiply
    761.99x = 1,143.18 × 275.45
  4. Step 4: Simplify right side
    761.99x = 314,883.22
  5. Step 5: Solve for x
    x = 314,883.22/761.99
  6. Step 6: Final answer
    x = 413.24

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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.