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Finding the Fourth Proportional to 515.48, 711.45 and 358.34

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Solution

The fourth proportional to 515.48, 711.45 and 358.34 is: 494.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.48 : 711.45 = 358.34 : x
  2. Step 2: Convert to fraction form
    515.48/711.45 = 358.34/x
  3. Step 3: Cross multiply
    515.48x = 711.45 × 358.34
  4. Step 4: Simplify right side
    515.48x = 254,940.99
  5. Step 5: Solve for x
    x = 254,940.99/515.48
  6. Step 6: Final answer
    x = 494.57

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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.