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Finding the Fourth Proportional to 425,425.80, 638,138.70 and 212,849.40

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Solution

The fourth proportional to 425,425.80, 638,138.70 and 212,849.40 is: 319,274.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,425.80 : 638,138.70 = 212,849.40 : x
  2. Step 2: Convert to fraction form
    425,425.80/638,138.70 = 212,849.40/x
  3. Step 3: Cross multiply
    425,425.80x = 638,138.70 × 212,849.40
  4. Step 4: Simplify right side
    425,425.80x = 135,827,439,411.78
  5. Step 5: Solve for x
    x = 135,827,439,411.78/425,425.80
  6. Step 6: Final answer
    x = 319,274.10

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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.