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Finding the Fourth Proportional to 1,055.57, 1,578.69 and 958.68

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Solution

The fourth proportional to 1,055.57, 1,578.69 and 958.68 is: 1,433.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.57 : 1,578.69 = 958.68 : x
  2. Step 2: Convert to fraction form
    1,055.57/1,578.69 = 958.68/x
  3. Step 3: Cross multiply
    1,055.57x = 1,578.69 × 958.68
  4. Step 4: Simplify right side
    1,055.57x = 1,513,458.53
  5. Step 5: Solve for x
    x = 1,513,458.53/1,055.57
  6. Step 6: Final answer
    x = 1,433.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.