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Finding the Fourth Proportional to 125,136.80, 172,647.44 and 76,720.80

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Solution

The fourth proportional to 125,136.80, 172,647.44 and 76,720.80 is: 105,849.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,136.80 : 172,647.44 = 76,720.80 : x
  2. Step 2: Convert to fraction form
    125,136.80/172,647.44 = 76,720.80/x
  3. Step 3: Cross multiply
    125,136.80x = 172,647.44 × 76,720.80
  4. Step 4: Simplify right side
    125,136.80x = 13,245,649,714.75
  5. Step 5: Solve for x
    x = 13,245,649,714.75/125,136.80
  6. Step 6: Final answer
    x = 105,849.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.