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Finding the Fourth Proportional to 639,419.79, 958,453.91 and 212,841.80

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Solution

The fourth proportional to 639,419.79, 958,453.91 and 212,841.80 is: 319,037.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,419.79 : 958,453.91 = 212,841.80 : x
  2. Step 2: Convert to fraction form
    639,419.79/958,453.91 = 212,841.80/x
  3. Step 3: Cross multiply
    639,419.79x = 958,453.91 × 212,841.80
  4. Step 4: Simplify right side
    639,419.79x = 203,999,055,421.44
  5. Step 5: Solve for x
    x = 203,999,055,421.44/639,419.79
  6. Step 6: Final answer
    x = 319,037.76

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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.