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Finding the Fourth Proportional to 312,616.08, 431,409.60 and 169,380

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Solution

The fourth proportional to 312,616.08, 431,409.60 and 169,380 is: 233,744.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,616.08 : 431,409.60 = 169,380 : x
  2. Step 2: Convert to fraction form
    312,616.08/431,409.60 = 169,380/x
  3. Step 3: Cross multiply
    312,616.08x = 431,409.60 × 169,380
  4. Step 4: Simplify right side
    312,616.08x = 73,072,158,048
  5. Step 5: Solve for x
    x = 73,072,158,048/312,616.08
  6. Step 6: Final answer
    x = 233,744.08

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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.