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Finding the Fourth Proportional to 817.44, 1,128.10 and 444.45

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Solution

The fourth proportional to 817.44, 1,128.10 and 444.45 is: 613.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.44 : 1,128.10 = 444.45 : x
  2. Step 2: Convert to fraction form
    817.44/1,128.10 = 444.45/x
  3. Step 3: Cross multiply
    817.44x = 1,128.10 × 444.45
  4. Step 4: Simplify right side
    817.44x = 501,376.18
  5. Step 5: Solve for x
    x = 501,376.18/817.44
  6. Step 6: Final answer
    x = 613.35

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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.