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Finding the Fourth Proportional to 425,427.80, 638,141.70 and 212,851.40

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Solution

The fourth proportional to 425,427.80, 638,141.70 and 212,851.40 is: 319,277.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,427.80 : 638,141.70 = 212,851.40 : x
  2. Step 2: Convert to fraction form
    425,427.80/638,141.70 = 212,851.40/x
  3. Step 3: Cross multiply
    425,427.80x = 638,141.70 × 212,851.40
  4. Step 4: Simplify right side
    425,427.80x = 135,829,354,243.38
  5. Step 5: Solve for x
    x = 135,829,354,243.38/425,427.80
  6. Step 6: Final answer
    x = 319,277.10

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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.