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Finding the Fourth Proportional to 528.15, 728.09 and 370.31

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Solution

The fourth proportional to 528.15, 728.09 and 370.31 is: 510.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.15 : 728.09 = 370.31 : x
  2. Step 2: Convert to fraction form
    528.15/728.09 = 370.31/x
  3. Step 3: Cross multiply
    528.15x = 728.09 × 370.31
  4. Step 4: Simplify right side
    528.15x = 269,614.90
  5. Step 5: Solve for x
    x = 269,614.90/528.15
  6. Step 6: Final answer
    x = 510.49

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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.