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Finding the Fourth Proportional to 253,663.34, 380,529.95 and 85,231.79

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Solution

The fourth proportional to 253,663.34, 380,529.95 and 85,231.79 is: 127,859.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,663.34 : 380,529.95 = 85,231.79 : x
  2. Step 2: Convert to fraction form
    253,663.34/380,529.95 = 85,231.79/x
  3. Step 3: Cross multiply
    253,663.34x = 380,529.95 × 85,231.79
  4. Step 4: Simplify right side
    253,663.34x = 32,433,247,294.48
  5. Step 5: Solve for x
    x = 32,433,247,294.48/253,663.34
  6. Step 6: Final answer
    x = 127,859.42

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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.