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Finding the Fourth Proportional to 307.42, 423.91 and 202.47

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Solution

The fourth proportional to 307.42, 423.91 and 202.47 is: 279.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.42 : 423.91 = 202.47 : x
  2. Step 2: Convert to fraction form
    307.42/423.91 = 202.47/x
  3. Step 3: Cross multiply
    307.42x = 423.91 × 202.47
  4. Step 4: Simplify right side
    307.42x = 85,830.73
  5. Step 5: Solve for x
    x = 85,830.73/307.42
  6. Step 6: Final answer
    x = 279.20

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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.