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Finding the Fourth Proportional to 528.22, 728.85 and 318.34

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Solution

The fourth proportional to 528.22, 728.85 and 318.34 is: 439.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.22 : 728.85 = 318.34 : x
  2. Step 2: Convert to fraction form
    528.22/728.85 = 318.34/x
  3. Step 3: Cross multiply
    528.22x = 728.85 × 318.34
  4. Step 4: Simplify right side
    528.22x = 232,022.11
  5. Step 5: Solve for x
    x = 232,022.11/528.22
  6. Step 6: Final answer
    x = 439.25

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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.