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Finding the Fourth Proportional to 280,613.80, 420,920.70 and 168,420.70

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Solution

The fourth proportional to 280,613.80, 420,920.70 and 168,420.70 is: 252,631.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,613.80 : 420,920.70 = 168,420.70 : x
  2. Step 2: Convert to fraction form
    280,613.80/420,920.70 = 168,420.70/x
  3. Step 3: Cross multiply
    280,613.80x = 420,920.70 × 168,420.70
  4. Step 4: Simplify right side
    280,613.80x = 70,891,758,938.49
  5. Step 5: Solve for x
    x = 70,891,758,938.49/280,613.80
  6. Step 6: Final answer
    x = 252,631.05

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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.