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Finding the Fourth Proportional to 521,739.90, 782,483.85 and 217,969.89

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Solution

The fourth proportional to 521,739.90, 782,483.85 and 217,969.89 is: 326,902.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,739.90 : 782,483.85 = 217,969.89 : x
  2. Step 2: Convert to fraction form
    521,739.90/782,483.85 = 217,969.89/x
  3. Step 3: Cross multiply
    521,739.90x = 782,483.85 × 217,969.89
  4. Step 4: Simplify right side
    521,739.90x = 170,557,918,711.28
  5. Step 5: Solve for x
    x = 170,557,918,711.28/521,739.90
  6. Step 6: Final answer
    x = 326,902.20

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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.