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Finding the Fourth Proportional to 723.76, 1,085.79 and 290.95

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Solution

The fourth proportional to 723.76, 1,085.79 and 290.95 is: 436.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.76 : 1,085.79 = 290.95 : x
  2. Step 2: Convert to fraction form
    723.76/1,085.79 = 290.95/x
  3. Step 3: Cross multiply
    723.76x = 1,085.79 × 290.95
  4. Step 4: Simplify right side
    723.76x = 315,907.16
  5. Step 5: Solve for x
    x = 315,907.16/723.76
  6. Step 6: Final answer
    x = 436.48

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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.