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Finding the Fourth Proportional to 817.49, 1,128.12 and 444.45

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Solution

The fourth proportional to 817.49, 1,128.12 and 444.45 is: 613.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.49 : 1,128.12 = 444.45 : x
  2. Step 2: Convert to fraction form
    817.49/1,128.12 = 444.45/x
  3. Step 3: Cross multiply
    817.49x = 1,128.12 × 444.45
  4. Step 4: Simplify right side
    817.49x = 501,392.93
  5. Step 5: Solve for x
    x = 501,392.93/817.49
  6. Step 6: Final answer
    x = 613.34

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1.5x scale

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.