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Finding the Fourth Proportional to 1,315.84, 1,974.20 and 878.84

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Solution

The fourth proportional to 1,315.84, 1,974.20 and 878.84 is: 1,318.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.84 : 1,974.20 = 878.84 : x
  2. Step 2: Convert to fraction form
    1,315.84/1,974.20 = 878.84/x
  3. Step 3: Cross multiply
    1,315.84x = 1,974.20 × 878.84
  4. Step 4: Simplify right side
    1,315.84x = 1,735,005.93
  5. Step 5: Solve for x
    x = 1,735,005.93/1,315.84
  6. Step 6: Final answer
    x = 1,318.55

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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.