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Finding the Fourth Proportional to 867.20, 1,299.92 and 346.95

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Solution

The fourth proportional to 867.20, 1,299.92 and 346.95 is: 520.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.20 : 1,299.92 = 346.95 : x
  2. Step 2: Convert to fraction form
    867.20/1,299.92 = 346.95/x
  3. Step 3: Cross multiply
    867.20x = 1,299.92 × 346.95
  4. Step 4: Simplify right side
    867.20x = 451,005.51
  5. Step 5: Solve for x
    x = 451,005.51/867.20
  6. Step 6: Final answer
    x = 520.07

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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.