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Finding the Fourth Proportional to 639,428.16, 958,500.72 and 218,416.08

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Solution

The fourth proportional to 639,428.16, 958,500.72 and 218,416.08 is: 327,404.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,428.16 : 958,500.72 = 218,416.08 : x
  2. Step 2: Convert to fraction form
    639,428.16/958,500.72 = 218,416.08/x
  3. Step 3: Cross multiply
    639,428.16x = 958,500.72 × 218,416.08
  4. Step 4: Simplify right side
    639,428.16x = 209,351,969,939.58
  5. Step 5: Solve for x
    x = 209,351,969,939.58/639,428.16
  6. Step 6: Final answer
    x = 327,404.99

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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.