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Finding the Fourth Proportional to 280,007.60, 420,011.40 and 80,310.20

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Solution

The fourth proportional to 280,007.60, 420,011.40 and 80,310.20 is: 120,465.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,007.60 : 420,011.40 = 80,310.20 : x
  2. Step 2: Convert to fraction form
    280,007.60/420,011.40 = 80,310.20/x
  3. Step 3: Cross multiply
    280,007.60x = 420,011.40 × 80,310.20
  4. Step 4: Simplify right side
    280,007.60x = 33,731,199,536.28
  5. Step 5: Solve for x
    x = 33,731,199,536.28/280,007.60
  6. Step 6: Final answer
    x = 120,465.30

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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.