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Finding the Fourth Proportional to 318,947.40, 478,421.10 and 219,414.60

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Solution

The fourth proportional to 318,947.40, 478,421.10 and 219,414.60 is: 329,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,947.40 : 478,421.10 = 219,414.60 : x
  2. Step 2: Convert to fraction form
    318,947.40/478,421.10 = 219,414.60/x
  3. Step 3: Cross multiply
    318,947.40x = 478,421.10 × 219,414.60
  4. Step 4: Simplify right side
    318,947.40x = 104,972,574,288.06
  5. Step 5: Solve for x
    x = 104,972,574,288.06/318,947.40
  6. Step 6: Final answer
    x = 329,121.90

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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.