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Finding the Fourth Proportional to 191,905.60, 287,858.40 and 125,420.80

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Solution

The fourth proportional to 191,905.60, 287,858.40 and 125,420.80 is: 188,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,905.60 : 287,858.40 = 125,420.80 : x
  2. Step 2: Convert to fraction form
    191,905.60/287,858.40 = 125,420.80/x
  3. Step 3: Cross multiply
    191,905.60x = 287,858.40 × 125,420.80
  4. Step 4: Simplify right side
    191,905.60x = 36,103,430,814.72
  5. Step 5: Solve for x
    x = 36,103,430,814.72/191,905.60
  6. Step 6: Final answer
    x = 188,131.20

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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.