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Finding the Fourth Proportional to 312,479.93, 431,220.15 and 169,236.69

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Solution

The fourth proportional to 312,479.93, 431,220.15 and 169,236.69 is: 233,545.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,479.93 : 431,220.15 = 169,236.69 : x
  2. Step 2: Convert to fraction form
    312,479.93/431,220.15 = 169,236.69/x
  3. Step 3: Cross multiply
    312,479.93x = 431,220.15 × 169,236.69
  4. Step 4: Simplify right side
    312,479.93x = 72,978,270,847.30
  5. Step 5: Solve for x
    x = 72,978,270,847.30/312,479.93
  6. Step 6: Final answer
    x = 233,545.47

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1.5x scale

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.