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Finding the Fourth Proportional to 308,949, 426,312.18 and 172,972.28

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Solution

The fourth proportional to 308,949, 426,312.18 and 172,972.28 is: 238,680.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,949 : 426,312.18 = 172,972.28 : x
  2. Step 2: Convert to fraction form
    308,949/426,312.18 = 172,972.28/x
  3. Step 3: Cross multiply
    308,949x = 426,312.18 × 172,972.28
  4. Step 4: Simplify right side
    308,949x = 73,740,189,766.37
  5. Step 5: Solve for x
    x = 73,740,189,766.37/308,949
  6. Step 6: Final answer
    x = 238,680.78

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1.5x scale

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.