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Finding the Fourth Proportional to 1,002.77, 1,386.79 and 878.23

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Solution

The fourth proportional to 1,002.77, 1,386.79 and 878.23 is: 1,214.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.77 : 1,386.79 = 878.23 : x
  2. Step 2: Convert to fraction form
    1,002.77/1,386.79 = 878.23/x
  3. Step 3: Cross multiply
    1,002.77x = 1,386.79 × 878.23
  4. Step 4: Simplify right side
    1,002.77x = 1,217,920.58
  5. Step 5: Solve for x
    x = 1,217,920.58/1,002.77
  6. Step 6: Final answer
    x = 1,214.56

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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.