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Finding the Fourth Proportional to 172,987.47, 259,133.83 and 86,171.86

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Solution

The fourth proportional to 172,987.47, 259,133.83 and 86,171.86 is: 129,084.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,987.47 : 259,133.83 = 86,171.86 : x
  2. Step 2: Convert to fraction form
    172,987.47/259,133.83 = 86,171.86/x
  3. Step 3: Cross multiply
    172,987.47x = 259,133.83 × 86,171.86
  4. Step 4: Simplify right side
    172,987.47x = 22,330,044,120.02
  5. Step 5: Solve for x
    x = 22,330,044,120.02/172,987.47
  6. Step 6: Final answer
    x = 129,084.75

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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.