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Finding the Fourth Proportional to 508.16, 762.40 and 219.60

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Solution

The fourth proportional to 508.16, 762.40 and 219.60 is: 329.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.16 : 762.40 = 219.60 : x
  2. Step 2: Convert to fraction form
    508.16/762.40 = 219.60/x
  3. Step 3: Cross multiply
    508.16x = 762.40 × 219.60
  4. Step 4: Simplify right side
    508.16x = 167,423.04
  5. Step 5: Solve for x
    x = 167,423.04/508.16
  6. Step 6: Final answer
    x = 329.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.