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Finding the Fourth Proportional to 969.28, 1,337.28 and 619.92

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Solution

The fourth proportional to 969.28, 1,337.28 and 619.92 is: 855.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.28 : 1,337.28 = 619.92 : x
  2. Step 2: Convert to fraction form
    969.28/1,337.28 = 619.92/x
  3. Step 3: Cross multiply
    969.28x = 1,337.28 × 619.92
  4. Step 4: Simplify right side
    969.28x = 829,006.62
  5. Step 5: Solve for x
    x = 829,006.62/969.28
  6. Step 6: Final answer
    x = 855.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.