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Finding the Fourth Proportional to 307.60, 423.57 and 220.12

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Solution

The fourth proportional to 307.60, 423.57 and 220.12 is: 303.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.60 : 423.57 = 220.12 : x
  2. Step 2: Convert to fraction form
    307.60/423.57 = 220.12/x
  3. Step 3: Cross multiply
    307.60x = 423.57 × 220.12
  4. Step 4: Simplify right side
    307.60x = 93,236.23
  5. Step 5: Solve for x
    x = 93,236.23/307.60
  6. Step 6: Final answer
    x = 303.11

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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.