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Finding the Fourth Proportional to 969.86, 1,338.41 and 527.78

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Solution

The fourth proportional to 969.86, 1,338.41 and 527.78 is: 728.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.86 : 1,338.41 = 527.78 : x
  2. Step 2: Convert to fraction form
    969.86/1,338.41 = 527.78/x
  3. Step 3: Cross multiply
    969.86x = 1,338.41 × 527.78
  4. Step 4: Simplify right side
    969.86x = 706,386.03
  5. Step 5: Solve for x
    x = 706,386.03/969.86
  6. Step 6: Final answer
    x = 728.34

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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.