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Finding the Fourth Proportional to 280,420.20, 420,630.30 and 93,431.70

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Solution

The fourth proportional to 280,420.20, 420,630.30 and 93,431.70 is: 140,147.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,420.20 : 420,630.30 = 93,431.70 : x
  2. Step 2: Convert to fraction form
    280,420.20/420,630.30 = 93,431.70/x
  3. Step 3: Cross multiply
    280,420.20x = 420,630.30 × 93,431.70
  4. Step 4: Simplify right side
    280,420.20x = 39,300,204,000.51
  5. Step 5: Solve for x
    x = 39,300,204,000.51/280,420.20
  6. Step 6: Final answer
    x = 140,147.55

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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.