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Finding the Fourth Proportional to 529.72, 730.38 and 391.48

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Solution

The fourth proportional to 529.72, 730.38 and 391.48 is: 539.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.72 : 730.38 = 391.48 : x
  2. Step 2: Convert to fraction form
    529.72/730.38 = 391.48/x
  3. Step 3: Cross multiply
    529.72x = 730.38 × 391.48
  4. Step 4: Simplify right side
    529.72x = 285,929.16
  5. Step 5: Solve for x
    x = 285,929.16/529.72
  6. Step 6: Final answer
    x = 539.77

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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.