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Finding the Fourth Proportional to 515.98, 711.54 and 358.30

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Solution

The fourth proportional to 515.98, 711.54 and 358.30 is: 494.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.98 : 711.54 = 358.30 : x
  2. Step 2: Convert to fraction form
    515.98/711.54 = 358.30/x
  3. Step 3: Cross multiply
    515.98x = 711.54 × 358.30
  4. Step 4: Simplify right side
    515.98x = 254,944.78
  5. Step 5: Solve for x
    x = 254,944.78/515.98
  6. Step 6: Final answer
    x = 494.10

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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.