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Finding the Fourth Proportional to 515.08, 710.34 and 398.44

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Solution

The fourth proportional to 515.08, 710.34 and 398.44 is: 549.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.08 : 710.34 = 398.44 : x
  2. Step 2: Convert to fraction form
    515.08/710.34 = 398.44/x
  3. Step 3: Cross multiply
    515.08x = 710.34 × 398.44
  4. Step 4: Simplify right side
    515.08x = 283,027.87
  5. Step 5: Solve for x
    x = 283,027.87/515.08
  6. Step 6: Final answer
    x = 549.48

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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.