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Finding the Fourth Proportional to 307.61, 424.38 and 202.75

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Solution

The fourth proportional to 307.61, 424.38 and 202.75 is: 279.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.61 : 424.38 = 202.75 : x
  2. Step 2: Convert to fraction form
    307.61/424.38 = 202.75/x
  3. Step 3: Cross multiply
    307.61x = 424.38 × 202.75
  4. Step 4: Simplify right side
    307.61x = 86,041.22
  5. Step 5: Solve for x
    x = 86,041.22/307.61
  6. Step 6: Final answer
    x = 279.71

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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.