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Finding the Fourth Proportional to 172,274.60, 257,901.60 and 128,097.20

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Solution

The fourth proportional to 172,274.60, 257,901.60 and 128,097.20 is: 191,766.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,274.60 : 257,901.60 = 128,097.20 : x
  2. Step 2: Convert to fraction form
    172,274.60/257,901.60 = 128,097.20/x
  3. Step 3: Cross multiply
    172,274.60x = 257,901.60 × 128,097.20
  4. Step 4: Simplify right side
    172,274.60x = 33,036,472,835.52
  5. Step 5: Solve for x
    x = 33,036,472,835.52/172,274.60
  6. Step 6: Final answer
    x = 191,766.36

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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.