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Finding the Fourth Proportional to 579,638.40, 869,052.60 and 342,859.20

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Solution

The fourth proportional to 579,638.40, 869,052.60 and 342,859.20 is: 514,049.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,638.40 : 869,052.60 = 342,859.20 : x
  2. Step 2: Convert to fraction form
    579,638.40/869,052.60 = 342,859.20/x
  3. Step 3: Cross multiply
    579,638.40x = 869,052.60 × 342,859.20
  4. Step 4: Simplify right side
    579,638.40x = 297,962,679,193.92
  5. Step 5: Solve for x
    x = 297,962,679,193.92/579,638.40
  6. Step 6: Final answer
    x = 514,049.24

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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.