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Finding the Fourth Proportional to 817.55, 1,128.05 and 463.44

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Solution

The fourth proportional to 817.55, 1,128.05 and 463.44 is: 639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.55 : 1,128.05 = 463.44 : x
  2. Step 2: Convert to fraction form
    817.55/1,128.05 = 463.44/x
  3. Step 3: Cross multiply
    817.55x = 1,128.05 × 463.44
  4. Step 4: Simplify right side
    817.55x = 522,781.17
  5. Step 5: Solve for x
    x = 522,781.17/817.55
  6. Step 6: Final answer
    x = 639.45

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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.