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Finding the Fourth Proportional to 872.36, 1,308.72 and 644.24

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Solution

The fourth proportional to 872.36, 1,308.72 and 644.24 is: 966.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.36 : 1,308.72 = 644.24 : x
  2. Step 2: Convert to fraction form
    872.36/1,308.72 = 644.24/x
  3. Step 3: Cross multiply
    872.36x = 1,308.72 × 644.24
  4. Step 4: Simplify right side
    872.36x = 843,129.77
  5. Step 5: Solve for x
    x = 843,129.77/872.36
  6. Step 6: Final answer
    x = 966.49

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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.