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Finding the Fourth Proportional to 390,401.96, 538,754.98 and 211,553.96

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Solution

The fourth proportional to 390,401.96, 538,754.98 and 211,553.96 is: 291,944.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,401.96 : 538,754.98 = 211,553.96 : x
  2. Step 2: Convert to fraction form
    390,401.96/538,754.98 = 211,553.96/x
  3. Step 3: Cross multiply
    390,401.96x = 538,754.98 × 211,553.96
  4. Step 4: Simplify right side
    390,401.96x = 113,975,749,488.72
  5. Step 5: Solve for x
    x = 113,975,749,488.72/390,401.96
  6. Step 6: Final answer
    x = 291,944.61

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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.