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Finding the Fourth Proportional to 1,905.08, 2,857.71 and 672.50

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Solution

The fourth proportional to 1,905.08, 2,857.71 and 672.50 is: 1,008.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.08 : 2,857.71 = 672.50 : x
  2. Step 2: Convert to fraction form
    1,905.08/2,857.71 = 672.50/x
  3. Step 3: Cross multiply
    1,905.08x = 2,857.71 × 672.50
  4. Step 4: Simplify right side
    1,905.08x = 1,921,795.69
  5. Step 5: Solve for x
    x = 1,921,795.69/1,905.08
  6. Step 6: Final answer
    x = 1,008.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.