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Finding the Fourth Proportional to 157,391.21, 217,193.55 and 85,769.71

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Solution

The fourth proportional to 157,391.21, 217,193.55 and 85,769.71 is: 118,358.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,391.21 : 217,193.55 = 85,769.71 : x
  2. Step 2: Convert to fraction form
    157,391.21/217,193.55 = 85,769.71/x
  3. Step 3: Cross multiply
    157,391.21x = 217,193.55 × 85,769.71
  4. Step 4: Simplify right side
    157,391.21x = 18,628,627,797.37
  5. Step 5: Solve for x
    x = 18,628,627,797.37/157,391.21
  6. Step 6: Final answer
    x = 118,358.76

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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.