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Finding the Fourth Proportional to 529.43, 730.46 and 398.21

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Solution

The fourth proportional to 529.43, 730.46 and 398.21 is: 549.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.43 : 730.46 = 398.21 : x
  2. Step 2: Convert to fraction form
    529.43/730.46 = 398.21/x
  3. Step 3: Cross multiply
    529.43x = 730.46 × 398.21
  4. Step 4: Simplify right side
    529.43x = 290,870.83
  5. Step 5: Solve for x
    x = 290,870.83/529.43
  6. Step 6: Final answer
    x = 549.41

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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.