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Finding the Fourth Proportional to 200.72, 277.12 and 145.37

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Solution

The fourth proportional to 200.72, 277.12 and 145.37 is: 200.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.72 : 277.12 = 145.37 : x
  2. Step 2: Convert to fraction form
    200.72/277.12 = 145.37/x
  3. Step 3: Cross multiply
    200.72x = 277.12 × 145.37
  4. Step 4: Simplify right side
    200.72x = 40,285.81
  5. Step 5: Solve for x
    x = 40,285.81/200.72
  6. Step 6: Final answer
    x = 200.70

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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.