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Finding the Fourth Proportional to 812,689.64, 1,219,114.64 and 280,140.56

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Solution

The fourth proportional to 812,689.64, 1,219,114.64 and 280,140.56 is: 420,238.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,689.64 : 1,219,114.64 = 280,140.56 : x
  2. Step 2: Convert to fraction form
    812,689.64/1,219,114.64 = 280,140.56/x
  3. Step 3: Cross multiply
    812,689.64x = 1,219,114.64 × 280,140.56
  4. Step 4: Simplify right side
    812,689.64x = 341,523,452,558.58
  5. Step 5: Solve for x
    x = 341,523,452,558.58/812,689.64
  6. Step 6: Final answer
    x = 420,238.47

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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.