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Finding the Fourth Proportional to 2,878.72, 4,318.80 and 1,319.08

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Solution

The fourth proportional to 2,878.72, 4,318.80 and 1,319.08 is: 1,978.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,878.72 : 4,318.80 = 1,319.08 : x
  2. Step 2: Convert to fraction form
    2,878.72/4,318.80 = 1,319.08/x
  3. Step 3: Cross multiply
    2,878.72x = 4,318.80 × 1,319.08
  4. Step 4: Simplify right side
    2,878.72x = 5,696,842.70
  5. Step 5: Solve for x
    x = 5,696,842.70/2,878.72
  6. Step 6: Final answer
    x = 1,978.95

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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.