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Finding the Fourth Proportional to 723.86, 1,085.78 and 291.01

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Solution

The fourth proportional to 723.86, 1,085.78 and 291.01 is: 436.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.86 : 1,085.78 = 291.01 : x
  2. Step 2: Convert to fraction form
    723.86/1,085.78 = 291.01/x
  3. Step 3: Cross multiply
    723.86x = 1,085.78 × 291.01
  4. Step 4: Simplify right side
    723.86x = 315,972.84
  5. Step 5: Solve for x
    x = 315,972.84/723.86
  6. Step 6: Final answer
    x = 436.51

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Double scale
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Similar ratio
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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.