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Finding the Fourth Proportional to 308,775.90, 426,118.31 and 172,808.78

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Solution

The fourth proportional to 308,775.90, 426,118.31 and 172,808.78 is: 238,480.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,775.90 : 426,118.31 = 172,808.78 : x
  2. Step 2: Convert to fraction form
    308,775.90/426,118.31 = 172,808.78/x
  3. Step 3: Cross multiply
    308,775.90x = 426,118.31 × 172,808.78
  4. Step 4: Simplify right side
    308,775.90x = 73,636,985,286.76
  5. Step 5: Solve for x
    x = 73,636,985,286.76/308,775.90
  6. Step 6: Final answer
    x = 238,480.35

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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.