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Finding the Fourth Proportional to 994.71, 1,372.08 and 645.39

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Solution

The fourth proportional to 994.71, 1,372.08 and 645.39 is: 890.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.71 : 1,372.08 = 645.39 : x
  2. Step 2: Convert to fraction form
    994.71/1,372.08 = 645.39/x
  3. Step 3: Cross multiply
    994.71x = 1,372.08 × 645.39
  4. Step 4: Simplify right side
    994.71x = 885,526.71
  5. Step 5: Solve for x
    x = 885,526.71/994.71
  6. Step 6: Final answer
    x = 890.24

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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.