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Finding the Fourth Proportional to 280,579.70, 420,869.55 and 70,217.30

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Solution

The fourth proportional to 280,579.70, 420,869.55 and 70,217.30 is: 105,325.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,579.70 : 420,869.55 = 70,217.30 : x
  2. Step 2: Convert to fraction form
    280,579.70/420,869.55 = 70,217.30/x
  3. Step 3: Cross multiply
    280,579.70x = 420,869.55 × 70,217.30
  4. Step 4: Simplify right side
    280,579.70x = 29,552,323,453.22
  5. Step 5: Solve for x
    x = 29,552,323,453.22/280,579.70
  6. Step 6: Final answer
    x = 105,325.95

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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.