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Finding the Fourth Proportional to 723.74, 1,085.65 and 290.89

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Solution

The fourth proportional to 723.74, 1,085.65 and 290.89 is: 436.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.74 : 1,085.65 = 290.89 : x
  2. Step 2: Convert to fraction form
    723.74/1,085.65 = 290.89/x
  3. Step 3: Cross multiply
    723.74x = 1,085.65 × 290.89
  4. Step 4: Simplify right side
    723.74x = 315,804.73
  5. Step 5: Solve for x
    x = 315,804.73/723.74
  6. Step 6: Final answer
    x = 436.35

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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.