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Finding the Fourth Proportional to 1,078.07, 1,488.20 and 785.57

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Solution

The fourth proportional to 1,078.07, 1,488.20 and 785.57 is: 1,084.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.07 : 1,488.20 = 785.57 : x
  2. Step 2: Convert to fraction form
    1,078.07/1,488.20 = 785.57/x
  3. Step 3: Cross multiply
    1,078.07x = 1,488.20 × 785.57
  4. Step 4: Simplify right side
    1,078.07x = 1,169,073.91
  5. Step 5: Solve for x
    x = 1,169,073.91/1,078.07
  6. Step 6: Final answer
    x = 1,084.42

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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.