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Finding the Fourth Proportional to 280,126.20, 420,125.22 and 80,445

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Solution

The fourth proportional to 280,126.20, 420,125.22 and 80,445 is: 120,649.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,126.20 : 420,125.22 = 80,445 : x
  2. Step 2: Convert to fraction form
    280,126.20/420,125.22 = 80,445/x
  3. Step 3: Cross multiply
    280,126.20x = 420,125.22 × 80,445
  4. Step 4: Simplify right side
    280,126.20x = 33,796,973,322.90
  5. Step 5: Solve for x
    x = 33,796,973,322.90/280,126.20
  6. Step 6: Final answer
    x = 120,649.10

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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.