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Finding the Fourth Proportional to 307.08, 424.20 and 219.60

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Solution

The fourth proportional to 307.08, 424.20 and 219.60 is: 303.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.08 : 424.20 = 219.60 : x
  2. Step 2: Convert to fraction form
    307.08/424.20 = 219.60/x
  3. Step 3: Cross multiply
    307.08x = 424.20 × 219.60
  4. Step 4: Simplify right side
    307.08x = 93,154.32
  5. Step 5: Solve for x
    x = 93,154.32/307.08
  6. Step 6: Final answer
    x = 303.36

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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.