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Finding the Fourth Proportional to 280,239.59, 420,429.80 and 80,560.34

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Solution

The fourth proportional to 280,239.59, 420,429.80 and 80,560.34 is: 120,860.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,239.59 : 420,429.80 = 80,560.34 : x
  2. Step 2: Convert to fraction form
    280,239.59/420,429.80 = 80,560.34/x
  3. Step 3: Cross multiply
    280,239.59x = 420,429.80 × 80,560.34
  4. Step 4: Simplify right side
    280,239.59x = 33,869,968,282.40
  5. Step 5: Solve for x
    x = 33,869,968,282.40/280,239.59
  6. Step 6: Final answer
    x = 120,860.75

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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.