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Finding the Fourth Proportional to 225,170.79, 310,692.51 and 128,372.80

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Solution

The fourth proportional to 225,170.79, 310,692.51 and 128,372.80 is: 177,129.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,170.79 : 310,692.51 = 128,372.80 : x
  2. Step 2: Convert to fraction form
    225,170.79/310,692.51 = 128,372.80/x
  3. Step 3: Cross multiply
    225,170.79x = 310,692.51 × 128,372.80
  4. Step 4: Simplify right side
    225,170.79x = 39,884,467,253.55
  5. Step 5: Solve for x
    x = 39,884,467,253.55/225,170.79
  6. Step 6: Final answer
    x = 177,129.85

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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.