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Finding the Fourth Proportional to 866.04, 1,299.87 and 427.79

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Solution

The fourth proportional to 866.04, 1,299.87 and 427.79 is: 642.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.04 : 1,299.87 = 427.79 : x
  2. Step 2: Convert to fraction form
    866.04/1,299.87 = 427.79/x
  3. Step 3: Cross multiply
    866.04x = 1,299.87 × 427.79
  4. Step 4: Simplify right side
    866.04x = 556,072.17
  5. Step 5: Solve for x
    x = 556,072.17/866.04
  6. Step 6: Final answer
    x = 642.08

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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.