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Finding the Fourth Proportional to 515.30, 711.43 and 357.88

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Solution

The fourth proportional to 515.30, 711.43 and 357.88 is: 494.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.30 : 711.43 = 357.88 : x
  2. Step 2: Convert to fraction form
    515.30/711.43 = 357.88/x
  3. Step 3: Cross multiply
    515.30x = 711.43 × 357.88
  4. Step 4: Simplify right side
    515.30x = 254,603.90
  5. Step 5: Solve for x
    x = 254,603.90/515.30
  6. Step 6: Final answer
    x = 494.09

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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.