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Finding the Fourth Proportional to 1,022.54, 1,411.12 and 556.78

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Solution

The fourth proportional to 1,022.54, 1,411.12 and 556.78 is: 768.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,022.54 : 1,411.12 = 556.78 : x
  2. Step 2: Convert to fraction form
    1,022.54/1,411.12 = 556.78/x
  3. Step 3: Cross multiply
    1,022.54x = 1,411.12 × 556.78
  4. Step 4: Simplify right side
    1,022.54x = 785,683.39
  5. Step 5: Solve for x
    x = 785,683.39/1,022.54
  6. Step 6: Final answer
    x = 768.36

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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.