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Finding the Fourth Proportional to 1,140.79, 1,574.24 and 668.70

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Solution

The fourth proportional to 1,140.79, 1,574.24 and 668.70 is: 922.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.79 : 1,574.24 = 668.70 : x
  2. Step 2: Convert to fraction form
    1,140.79/1,574.24 = 668.70/x
  3. Step 3: Cross multiply
    1,140.79x = 1,574.24 × 668.70
  4. Step 4: Simplify right side
    1,140.79x = 1,052,694.29
  5. Step 5: Solve for x
    x = 1,052,694.29/1,140.79
  6. Step 6: Final answer
    x = 922.78

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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.