Home / 280,106.28-420,214.05-90,613.62

Finding the Fourth Proportional to 280,106.28, 420,214.05 and 90,613.62

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Solution

The fourth proportional to 280,106.28, 420,214.05 and 90,613.62 is: 135,938.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,106.28 : 420,214.05 = 90,613.62 : x
  2. Step 2: Convert to fraction form
    280,106.28/420,214.05 = 90,613.62/x
  3. Step 3: Cross multiply
    280,106.28x = 420,214.05 × 90,613.62
  4. Step 4: Simplify right side
    280,106.28x = 38,077,116,245.36
  5. Step 5: Solve for x
    x = 38,077,116,245.36/280,106.28
  6. Step 6: Final answer
    x = 135,938.10

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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.