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Finding the Fourth Proportional to 994.56, 1,372.50 and 645.25

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Solution

The fourth proportional to 994.56, 1,372.50 and 645.25 is: 890.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.56 : 1,372.50 = 645.25 : x
  2. Step 2: Convert to fraction form
    994.56/1,372.50 = 645.25/x
  3. Step 3: Cross multiply
    994.56x = 1,372.50 × 645.25
  4. Step 4: Simplify right side
    994.56x = 885,605.63
  5. Step 5: Solve for x
    x = 885,605.63/994.56
  6. Step 6: Final answer
    x = 890.45

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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.