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Finding the Fourth Proportional to 393,608.72, 590,339.64 and 105,423.68

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Solution

The fourth proportional to 393,608.72, 590,339.64 and 105,423.68 is: 158,115.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,608.72 : 590,339.64 = 105,423.68 : x
  2. Step 2: Convert to fraction form
    393,608.72/590,339.64 = 105,423.68/x
  3. Step 3: Cross multiply
    393,608.72x = 590,339.64 × 105,423.68
  4. Step 4: Simplify right side
    393,608.72x = 62,235,777,298.68
  5. Step 5: Solve for x
    x = 62,235,777,298.68/393,608.72
  6. Step 6: Final answer
    x = 158,115.85

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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.