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Finding the Fourth Proportional to 528.84, 728.58 and 381.22

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Solution

The fourth proportional to 528.84, 728.58 and 381.22 is: 525.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.84 : 728.58 = 381.22 : x
  2. Step 2: Convert to fraction form
    528.84/728.58 = 381.22/x
  3. Step 3: Cross multiply
    528.84x = 728.58 × 381.22
  4. Step 4: Simplify right side
    528.84x = 277,749.27
  5. Step 5: Solve for x
    x = 277,749.27/528.84
  6. Step 6: Final answer
    x = 525.20

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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.