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Finding the Fourth Proportional to 931.36, 1,283.28 and 669.28

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Solution

The fourth proportional to 931.36, 1,283.28 and 669.28 is: 922.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.36 : 1,283.28 = 669.28 : x
  2. Step 2: Convert to fraction form
    931.36/1,283.28 = 669.28/x
  3. Step 3: Cross multiply
    931.36x = 1,283.28 × 669.28
  4. Step 4: Simplify right side
    931.36x = 858,873.64
  5. Step 5: Solve for x
    x = 858,873.64/931.36
  6. Step 6: Final answer
    x = 922.17

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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.