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Finding the Fourth Proportional to 310,486.73, 428,507.39 and 172,679.63

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Solution

The fourth proportional to 310,486.73, 428,507.39 and 172,679.63 is: 238,317.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,486.73 : 428,507.39 = 172,679.63 : x
  2. Step 2: Convert to fraction form
    310,486.73/428,507.39 = 172,679.63/x
  3. Step 3: Cross multiply
    310,486.73x = 428,507.39 × 172,679.63
  4. Step 4: Simplify right side
    310,486.73x = 73,994,497,765.34
  5. Step 5: Solve for x
    x = 73,994,497,765.34/310,486.73
  6. Step 6: Final answer
    x = 238,317.75

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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.