Home / 429,243.20-643,346.40-218,772.80

Finding the Fourth Proportional to 429,243.20, 643,346.40 and 218,772.80

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Solution

The fourth proportional to 429,243.20, 643,346.40 and 218,772.80 is: 327,894.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,243.20 : 643,346.40 = 218,772.80 : x
  2. Step 2: Convert to fraction form
    429,243.20/643,346.40 = 218,772.80/x
  3. Step 3: Cross multiply
    429,243.20x = 643,346.40 × 218,772.80
  4. Step 4: Simplify right side
    429,243.20x = 140,746,693,297.92
  5. Step 5: Solve for x
    x = 140,746,693,297.92/429,243.20
  6. Step 6: Final answer
    x = 327,894.99

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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.