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Finding the Fourth Proportional to 172,578.04, 258,759.84 and 72,686.80

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Solution

The fourth proportional to 172,578.04, 258,759.84 and 72,686.80 is: 108,985.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,578.04 : 258,759.84 = 72,686.80 : x
  2. Step 2: Convert to fraction form
    172,578.04/258,759.84 = 72,686.80/x
  3. Step 3: Cross multiply
    172,578.04x = 258,759.84 × 72,686.80
  4. Step 4: Simplify right side
    172,578.04x = 18,808,424,738.11
  5. Step 5: Solve for x
    x = 18,808,424,738.11/172,578.04
  6. Step 6: Final answer
    x = 108,985.04

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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.