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Finding the Fourth Proportional to 867.27, 1,299.78 and 477.45

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Solution

The fourth proportional to 867.27, 1,299.78 and 477.45 is: 715.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.27 : 1,299.78 = 477.45 : x
  2. Step 2: Convert to fraction form
    867.27/1,299.78 = 477.45/x
  3. Step 3: Cross multiply
    867.27x = 1,299.78 × 477.45
  4. Step 4: Simplify right side
    867.27x = 620,579.96
  5. Step 5: Solve for x
    x = 620,579.96/867.27
  6. Step 6: Final answer
    x = 715.56

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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.