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Finding the Fourth Proportional to 2,865.80, 4,297.42 and 813.32

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Solution

The fourth proportional to 2,865.80, 4,297.42 and 813.32 is: 1,219.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,865.80 : 4,297.42 = 813.32 : x
  2. Step 2: Convert to fraction form
    2,865.80/4,297.42 = 813.32/x
  3. Step 3: Cross multiply
    2,865.80x = 4,297.42 × 813.32
  4. Step 4: Simplify right side
    2,865.80x = 3,495,177.63
  5. Step 5: Solve for x
    x = 3,495,177.63/2,865.80
  6. Step 6: Final answer
    x = 1,219.62

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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.