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Finding the Fourth Proportional to 867.28, 1,300.12 and 289.76

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Solution

The fourth proportional to 867.28, 1,300.12 and 289.76 is: 434.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.28 : 1,300.12 = 289.76 : x
  2. Step 2: Convert to fraction form
    867.28/1,300.12 = 289.76/x
  3. Step 3: Cross multiply
    867.28x = 1,300.12 × 289.76
  4. Step 4: Simplify right side
    867.28x = 376,722.77
  5. Step 5: Solve for x
    x = 376,722.77/867.28
  6. Step 6: Final answer
    x = 434.37

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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.