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Finding the Fourth Proportional to 1,081.29, 1,488.29 and 957.45

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Solution

The fourth proportional to 1,081.29, 1,488.29 and 957.45 is: 1,317.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.29 : 1,488.29 = 957.45 : x
  2. Step 2: Convert to fraction form
    1,081.29/1,488.29 = 957.45/x
  3. Step 3: Cross multiply
    1,081.29x = 1,488.29 × 957.45
  4. Step 4: Simplify right side
    1,081.29x = 1,424,963.26
  5. Step 5: Solve for x
    x = 1,424,963.26/1,081.29
  6. Step 6: Final answer
    x = 1,317.84

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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.