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Finding the Fourth Proportional to 724.08, 1,085.94 and 285.32

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Solution

The fourth proportional to 724.08, 1,085.94 and 285.32 is: 427.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.08 : 1,085.94 = 285.32 : x
  2. Step 2: Convert to fraction form
    724.08/1,085.94 = 285.32/x
  3. Step 3: Cross multiply
    724.08x = 1,085.94 × 285.32
  4. Step 4: Simplify right side
    724.08x = 309,840.40
  5. Step 5: Solve for x
    x = 309,840.40/724.08
  6. Step 6: Final answer
    x = 427.91

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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.