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Finding the Fourth Proportional to 528.36, 728.88 and 331.56

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Solution

The fourth proportional to 528.36, 728.88 and 331.56 is: 457.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.36 : 728.88 = 331.56 : x
  2. Step 2: Convert to fraction form
    528.36/728.88 = 331.56/x
  3. Step 3: Cross multiply
    528.36x = 728.88 × 331.56
  4. Step 4: Simplify right side
    528.36x = 241,667.45
  5. Step 5: Solve for x
    x = 241,667.45/528.36
  6. Step 6: Final answer
    x = 457.39

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1.5x scale

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.