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Finding the Fourth Proportional to 354,439.72, 531,688.38 and 105,121

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Solution

The fourth proportional to 354,439.72, 531,688.38 and 105,121 is: 157,690.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,439.72 : 531,688.38 = 105,121 : x
  2. Step 2: Convert to fraction form
    354,439.72/531,688.38 = 105,121/x
  3. Step 3: Cross multiply
    354,439.72x = 531,688.38 × 105,121
  4. Step 4: Simplify right side
    354,439.72x = 55,891,614,193.98
  5. Step 5: Solve for x
    x = 55,891,614,193.98/354,439.72
  6. Step 6: Final answer
    x = 157,690.04

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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.