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Finding the Fourth Proportional to 389,881.60, 538,035.20 and 211,033.60

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Solution

The fourth proportional to 389,881.60, 538,035.20 and 211,033.60 is: 291,225.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,881.60 : 538,035.20 = 211,033.60 : x
  2. Step 2: Convert to fraction form
    389,881.60/538,035.20 = 211,033.60/x
  3. Step 3: Cross multiply
    389,881.60x = 538,035.20 × 211,033.60
  4. Step 4: Simplify right side
    389,881.60x = 113,543,505,182.72
  5. Step 5: Solve for x
    x = 113,543,505,182.72/389,881.60
  6. Step 6: Final answer
    x = 291,225.61

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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.