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Finding the Fourth Proportional to 280,020.20, 420,030.30 and 251,151.80

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Solution

The fourth proportional to 280,020.20, 420,030.30 and 251,151.80 is: 376,727.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,020.20 : 420,030.30 = 251,151.80 : x
  2. Step 2: Convert to fraction form
    280,020.20/420,030.30 = 251,151.80/x
  3. Step 3: Cross multiply
    280,020.20x = 420,030.30 × 251,151.80
  4. Step 4: Simplify right side
    280,020.20x = 105,491,365,899.54
  5. Step 5: Solve for x
    x = 105,491,365,899.54/280,020.20
  6. Step 6: Final answer
    x = 376,727.70

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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.