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Finding the Fourth Proportional to 389,423.40, 584,135.10 and 212,276.40

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Solution

The fourth proportional to 389,423.40, 584,135.10 and 212,276.40 is: 318,414.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,423.40 : 584,135.10 = 212,276.40 : x
  2. Step 2: Convert to fraction form
    389,423.40/584,135.10 = 212,276.40/x
  3. Step 3: Cross multiply
    389,423.40x = 584,135.10 × 212,276.40
  4. Step 4: Simplify right side
    389,423.40x = 123,998,096,141.64
  5. Step 5: Solve for x
    x = 123,998,096,141.64/389,423.40
  6. Step 6: Final answer
    x = 318,414.60

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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.