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Finding the Fourth Proportional to 172,518.30, 258,623.55 and 67,312.80

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Solution

The fourth proportional to 172,518.30, 258,623.55 and 67,312.80 is: 100,909.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,518.30 : 258,623.55 = 67,312.80 : x
  2. Step 2: Convert to fraction form
    172,518.30/258,623.55 = 67,312.80/x
  3. Step 3: Cross multiply
    172,518.30x = 258,623.55 × 67,312.80
  4. Step 4: Simplify right side
    172,518.30x = 17,408,675,296.44
  5. Step 5: Solve for x
    x = 17,408,675,296.44/172,518.30
  6. Step 6: Final answer
    x = 100,909.15

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1.5x scale

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.