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Finding the Fourth Proportional to 638,990.20, 958,383.54 and 212,490.52

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Solution

The fourth proportional to 638,990.20, 958,383.54 and 212,490.52 is: 318,701.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,990.20 : 958,383.54 = 212,490.52 : x
  2. Step 2: Convert to fraction form
    638,990.20/958,383.54 = 212,490.52/x
  3. Step 3: Cross multiply
    638,990.20x = 958,383.54 × 212,490.52
  4. Step 4: Simplify right side
    638,990.20x = 203,647,416,774.04
  5. Step 5: Solve for x
    x = 203,647,416,774.04/638,990.20
  6. Step 6: Final answer
    x = 318,701.94

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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.