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Finding the Fourth Proportional to 878.85, 1,212.90 and 506.05

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Solution

The fourth proportional to 878.85, 1,212.90 and 506.05 is: 698.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.85 : 1,212.90 = 506.05 : x
  2. Step 2: Convert to fraction form
    878.85/1,212.90 = 506.05/x
  3. Step 3: Cross multiply
    878.85x = 1,212.90 × 506.05
  4. Step 4: Simplify right side
    878.85x = 613,779.45
  5. Step 5: Solve for x
    x = 613,779.45/878.85
  6. Step 6: Final answer
    x = 698.39

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1.5x scale

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.