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Finding the Fourth Proportional to 528.45, 728.83 and 417.72

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Solution

The fourth proportional to 528.45, 728.83 and 417.72 is: 576.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.45 : 728.83 = 417.72 : x
  2. Step 2: Convert to fraction form
    528.45/728.83 = 417.72/x
  3. Step 3: Cross multiply
    528.45x = 728.83 × 417.72
  4. Step 4: Simplify right side
    528.45x = 304,446.87
  5. Step 5: Solve for x
    x = 304,446.87/528.45
  6. Step 6: Final answer
    x = 576.11

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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.