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Finding the Fourth Proportional to 1,017.28, 1,403.68 and 668.40

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Solution

The fourth proportional to 1,017.28, 1,403.68 and 668.40 is: 922.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.28 : 1,403.68 = 668.40 : x
  2. Step 2: Convert to fraction form
    1,017.28/1,403.68 = 668.40/x
  3. Step 3: Cross multiply
    1,017.28x = 1,403.68 × 668.40
  4. Step 4: Simplify right side
    1,017.28x = 938,219.71
  5. Step 5: Solve for x
    x = 938,219.71/1,017.28
  6. Step 6: Final answer
    x = 922.28

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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.