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Finding the Fourth Proportional to 528.09, 728.60 and 318.24

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Solution

The fourth proportional to 528.09, 728.60 and 318.24 is: 439.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.09 : 728.60 = 318.24 : x
  2. Step 2: Convert to fraction form
    528.09/728.60 = 318.24/x
  3. Step 3: Cross multiply
    528.09x = 728.60 × 318.24
  4. Step 4: Simplify right side
    528.09x = 231,868.07
  5. Step 5: Solve for x
    x = 231,868.07/528.09
  6. Step 6: Final answer
    x = 439.07

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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.