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Finding the Fourth Proportional to 172,579.20, 258,868.80 and 47,920.20

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Solution

The fourth proportional to 172,579.20, 258,868.80 and 47,920.20 is: 71,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,579.20 : 258,868.80 = 47,920.20 : x
  2. Step 2: Convert to fraction form
    172,579.20/258,868.80 = 47,920.20/x
  3. Step 3: Cross multiply
    172,579.20x = 258,868.80 × 47,920.20
  4. Step 4: Simplify right side
    172,579.20x = 12,405,044,669.76
  5. Step 5: Solve for x
    x = 12,405,044,669.76/172,579.20
  6. Step 6: Final answer
    x = 71,880.30

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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.