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Finding the Fourth Proportional to 515.40, 710.90 and 318.66

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Solution

The fourth proportional to 515.40, 710.90 and 318.66 is: 439.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.40 : 710.90 = 318.66 : x
  2. Step 2: Convert to fraction form
    515.40/710.90 = 318.66/x
  3. Step 3: Cross multiply
    515.40x = 710.90 × 318.66
  4. Step 4: Simplify right side
    515.40x = 226,535.39
  5. Step 5: Solve for x
    x = 226,535.39/515.40
  6. Step 6: Final answer
    x = 439.53

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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.