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Finding the Fourth Proportional to 391,756.80, 587,721.60 and 125,529.60

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Solution

The fourth proportional to 391,756.80, 587,721.60 and 125,529.60 is: 188,322.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,756.80 : 587,721.60 = 125,529.60 : x
  2. Step 2: Convert to fraction form
    391,756.80/587,721.60 = 125,529.60/x
  3. Step 3: Cross multiply
    391,756.80x = 587,721.60 × 125,529.60
  4. Step 4: Simplify right side
    391,756.80x = 73,776,457,359.36
  5. Step 5: Solve for x
    x = 73,776,457,359.36/391,756.80
  6. Step 6: Final answer
    x = 188,322.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.