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Finding the Fourth Proportional to 905.82, 1,250.73 and 644.10

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Solution

The fourth proportional to 905.82, 1,250.73 and 644.10 is: 889.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.82 : 1,250.73 = 644.10 : x
  2. Step 2: Convert to fraction form
    905.82/1,250.73 = 644.10/x
  3. Step 3: Cross multiply
    905.82x = 1,250.73 × 644.10
  4. Step 4: Simplify right side
    905.82x = 805,595.19
  5. Step 5: Solve for x
    x = 805,595.19/905.82
  6. Step 6: Final answer
    x = 889.35

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1.5x scale

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.