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Finding the Fourth Proportional to 384,699.60, 530,540.28 and 320,381.28

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Solution

The fourth proportional to 384,699.60, 530,540.28 and 320,381.28 is: 441,838.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    384,699.60 : 530,540.28 = 320,381.28 : x
  2. Step 2: Convert to fraction form
    384,699.60/530,540.28 = 320,381.28/x
  3. Step 3: Cross multiply
    384,699.60x = 530,540.28 × 320,381.28
  4. Step 4: Simplify right side
    384,699.60x = 169,975,173,997.96
  5. Step 5: Solve for x
    x = 169,975,173,997.96/384,699.60
  6. Step 6: Final answer
    x = 441,838.71

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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.