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Finding the Fourth Proportional to 394,991.78, 592,549.08 and 128,690.24

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Solution

The fourth proportional to 394,991.78, 592,549.08 and 128,690.24 is: 193,055.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,991.78 : 592,549.08 = 128,690.24 : x
  2. Step 2: Convert to fraction form
    394,991.78/592,549.08 = 128,690.24/x
  3. Step 3: Cross multiply
    394,991.78x = 592,549.08 × 128,690.24
  4. Step 4: Simplify right side
    394,991.78x = 76,255,283,316.98
  5. Step 5: Solve for x
    x = 76,255,283,316.98/394,991.78
  6. Step 6: Final answer
    x = 193,055.37

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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.