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Finding the Fourth Proportional to 841.28, 1,160.36 and 620.24

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Solution

The fourth proportional to 841.28, 1,160.36 and 620.24 is: 855.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.28 : 1,160.36 = 620.24 : x
  2. Step 2: Convert to fraction form
    841.28/1,160.36 = 620.24/x
  3. Step 3: Cross multiply
    841.28x = 1,160.36 × 620.24
  4. Step 4: Simplify right side
    841.28x = 719,701.69
  5. Step 5: Solve for x
    x = 719,701.69/841.28
  6. Step 6: Final answer
    x = 855.48

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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.