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Finding the Fourth Proportional to 225,137.72, 310,697.40 and 128,339.79

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Solution

The fourth proportional to 225,137.72, 310,697.40 and 128,339.79 is: 177,113.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,137.72 : 310,697.40 = 128,339.79 : x
  2. Step 2: Convert to fraction form
    225,137.72/310,697.40 = 128,339.79/x
  3. Step 3: Cross multiply
    225,137.72x = 310,697.40 × 128,339.79
  4. Step 4: Simplify right side
    225,137.72x = 39,874,839,069.55
  5. Step 5: Solve for x
    x = 39,874,839,069.55/225,137.72
  6. Step 6: Final answer
    x = 177,113.10

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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.