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Finding the Fourth Proportional to 212,930.66, 319,859.62 and 128,730.48

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Solution

The fourth proportional to 212,930.66, 319,859.62 and 128,730.48 is: 193,376.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,930.66 : 319,859.62 = 128,730.48 : x
  2. Step 2: Convert to fraction form
    212,930.66/319,859.62 = 128,730.48/x
  3. Step 3: Cross multiply
    212,930.66x = 319,859.62 × 128,730.48
  4. Step 4: Simplify right side
    212,930.66x = 41,175,680,815.92
  5. Step 5: Solve for x
    x = 41,175,680,815.92/212,930.66
  6. Step 6: Final answer
    x = 193,376.01

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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.