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Finding the Fourth Proportional to 941.28, 1,297.80 and 679.20

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Solution

The fourth proportional to 941.28, 1,297.80 and 679.20 is: 936.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.28 : 1,297.80 = 679.20 : x
  2. Step 2: Convert to fraction form
    941.28/1,297.80 = 679.20/x
  3. Step 3: Cross multiply
    941.28x = 1,297.80 × 679.20
  4. Step 4: Simplify right side
    941.28x = 881,465.76
  5. Step 5: Solve for x
    x = 881,465.76/941.28
  6. Step 6: Final answer
    x = 936.45

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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.