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Finding the Fourth Proportional to 724.28, 1,085.67 and 313.07

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Solution

The fourth proportional to 724.28, 1,085.67 and 313.07 is: 469.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.28 : 1,085.67 = 313.07 : x
  2. Step 2: Convert to fraction form
    724.28/1,085.67 = 313.07/x
  3. Step 3: Cross multiply
    724.28x = 1,085.67 × 313.07
  4. Step 4: Simplify right side
    724.28x = 339,885.28
  5. Step 5: Solve for x
    x = 339,885.28/724.28
  6. Step 6: Final answer
    x = 469.28

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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.