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Finding the Fourth Proportional to 312,638.94, 431,440.43 and 169,399.55

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Solution

The fourth proportional to 312,638.94, 431,440.43 and 169,399.55 is: 233,770.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,638.94 : 431,440.43 = 169,399.55 : x
  2. Step 2: Convert to fraction form
    312,638.94/431,440.43 = 169,399.55/x
  3. Step 3: Cross multiply
    312,638.94x = 431,440.43 × 169,399.55
  4. Step 4: Simplify right side
    312,638.94x = 73,085,814,925.41
  5. Step 5: Solve for x
    x = 73,085,814,925.41/312,638.94
  6. Step 6: Final answer
    x = 233,770.67

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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.