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Finding the Fourth Proportional to 866.32, 1,299.02 and 378.80

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Solution

The fourth proportional to 866.32, 1,299.02 and 378.80 is: 568.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.32 : 1,299.02 = 378.80 : x
  2. Step 2: Convert to fraction form
    866.32/1,299.02 = 378.80/x
  3. Step 3: Cross multiply
    866.32x = 1,299.02 × 378.80
  4. Step 4: Simplify right side
    866.32x = 492,070.13
  5. Step 5: Solve for x
    x = 492,070.13/866.32
  6. Step 6: Final answer
    x = 568.00

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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.