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Finding the Fourth Proportional to 528.24, 727.29 and 445.15

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Solution

The fourth proportional to 528.24, 727.29 and 445.15 is: 612.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.24 : 727.29 = 445.15 : x
  2. Step 2: Convert to fraction form
    528.24/727.29 = 445.15/x
  3. Step 3: Cross multiply
    528.24x = 727.29 × 445.15
  4. Step 4: Simplify right side
    528.24x = 323,753.14
  5. Step 5: Solve for x
    x = 323,753.14/528.24
  6. Step 6: Final answer
    x = 612.89

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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.