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Finding the Fourth Proportional to 515.45, 710.98 and 318.62

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Solution

The fourth proportional to 515.45, 710.98 and 318.62 is: 439.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.45 : 710.98 = 318.62 : x
  2. Step 2: Convert to fraction form
    515.45/710.98 = 318.62/x
  3. Step 3: Cross multiply
    515.45x = 710.98 × 318.62
  4. Step 4: Simplify right side
    515.45x = 226,533.43
  5. Step 5: Solve for x
    x = 226,533.43/515.45
  6. Step 6: Final answer
    x = 439.48

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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.