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Finding the Fourth Proportional to 572,431.20, 857,912.40 and 319,711.20

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Solution

The fourth proportional to 572,431.20, 857,912.40 and 319,711.20 is: 479,156.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,431.20 : 857,912.40 = 319,711.20 : x
  2. Step 2: Convert to fraction form
    572,431.20/857,912.40 = 319,711.20/x
  3. Step 3: Cross multiply
    572,431.20x = 857,912.40 × 319,711.20
  4. Step 4: Simplify right side
    572,431.20x = 274,284,202,898.88
  5. Step 5: Solve for x
    x = 274,284,202,898.88/572,431.20
  6. Step 6: Final answer
    x = 479,156.63

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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.