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Finding the Fourth Proportional to 2,439.72, 3,657.15 and 878.45

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Solution

The fourth proportional to 2,439.72, 3,657.15 and 878.45 is: 1,316.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,439.72 : 3,657.15 = 878.45 : x
  2. Step 2: Convert to fraction form
    2,439.72/3,657.15 = 878.45/x
  3. Step 3: Cross multiply
    2,439.72x = 3,657.15 × 878.45
  4. Step 4: Simplify right side
    2,439.72x = 3,212,605.13
  5. Step 5: Solve for x
    x = 3,212,605.13/2,439.72
  6. Step 6: Final answer
    x = 1,316.79

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1.5x scale

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.