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Finding the Fourth Proportional to 308,819.70, 426,151.40 and 172,830.69

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Solution

The fourth proportional to 308,819.70, 426,151.40 and 172,830.69 is: 238,495.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,819.70 : 426,151.40 = 172,830.69 : x
  2. Step 2: Convert to fraction form
    308,819.70/426,151.40 = 172,830.69/x
  3. Step 3: Cross multiply
    308,819.70x = 426,151.40 × 172,830.69
  4. Step 4: Simplify right side
    308,819.70x = 73,652,039,642.31
  5. Step 5: Solve for x
    x = 73,652,039,642.31/308,819.70
  6. Step 6: Final answer
    x = 238,495.28

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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.