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Finding the Fourth Proportional to 823.84, 1,135.84 and 528.60

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Solution

The fourth proportional to 823.84, 1,135.84 and 528.60 is: 728.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.84 : 1,135.84 = 528.60 : x
  2. Step 2: Convert to fraction form
    823.84/1,135.84 = 528.60/x
  3. Step 3: Cross multiply
    823.84x = 1,135.84 × 528.60
  4. Step 4: Simplify right side
    823.84x = 600,405.02
  5. Step 5: Solve for x
    x = 600,405.02/823.84
  6. Step 6: Final answer
    x = 728.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.