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Finding the Fourth Proportional to 872.81, 1,308.90 and 256.36

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Solution

The fourth proportional to 872.81, 1,308.90 and 256.36 is: 384.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.81 : 1,308.90 = 256.36 : x
  2. Step 2: Convert to fraction form
    872.81/1,308.90 = 256.36/x
  3. Step 3: Cross multiply
    872.81x = 1,308.90 × 256.36
  4. Step 4: Simplify right side
    872.81x = 335,549.60
  5. Step 5: Solve for x
    x = 335,549.60/872.81
  6. Step 6: Final answer
    x = 384.45

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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.