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Finding the Fourth Proportional to 172,343.60, 258,005.10 and 128,166.20

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Solution

The fourth proportional to 172,343.60, 258,005.10 and 128,166.20 is: 191,869.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,343.60 : 258,005.10 = 128,166.20 : x
  2. Step 2: Convert to fraction form
    172,343.60/258,005.10 = 128,166.20/x
  3. Step 3: Cross multiply
    172,343.60x = 258,005.10 × 128,166.20
  4. Step 4: Simplify right side
    172,343.60x = 33,067,533,247.62
  5. Step 5: Solve for x
    x = 33,067,533,247.62/172,343.60
  6. Step 6: Final answer
    x = 191,869.81

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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.