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Finding the Fourth Proportional to 723.39, 1,085.07 and 290.45

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Solution

The fourth proportional to 723.39, 1,085.07 and 290.45 is: 435.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.39 : 1,085.07 = 290.45 : x
  2. Step 2: Convert to fraction form
    723.39/1,085.07 = 290.45/x
  3. Step 3: Cross multiply
    723.39x = 1,085.07 × 290.45
  4. Step 4: Simplify right side
    723.39x = 315,153.16
  5. Step 5: Solve for x
    x = 315,153.16/723.39
  6. Step 6: Final answer
    x = 435.66

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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.