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Finding the Fourth Proportional to 312,376.79, 431,078.00 and 169,136.39

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Solution

The fourth proportional to 312,376.79, 431,078.00 and 169,136.39 is: 233,407.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,376.79 : 431,078.00 = 169,136.39 : x
  2. Step 2: Convert to fraction form
    312,376.79/431,078.00 = 169,136.39/x
  3. Step 3: Cross multiply
    312,376.79x = 431,078.00 × 169,136.39
  4. Step 4: Simplify right side
    312,376.79x = 72,910,973,727.35
  5. Step 5: Solve for x
    x = 72,910,973,727.35/312,376.79
  6. Step 6: Final answer
    x = 233,407.15

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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.