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Finding the Fourth Proportional to 191,999.20, 287,998.80 and 129,330.40

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Solution

The fourth proportional to 191,999.20, 287,998.80 and 129,330.40 is: 193,995.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,999.20 : 287,998.80 = 129,330.40 : x
  2. Step 2: Convert to fraction form
    191,999.20/287,998.80 = 129,330.40/x
  3. Step 3: Cross multiply
    191,999.20x = 287,998.80 × 129,330.40
  4. Step 4: Simplify right side
    191,999.20x = 37,247,000,003.52
  5. Step 5: Solve for x
    x = 37,247,000,003.52/191,999.20
  6. Step 6: Final answer
    x = 193,995.60

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1.5x scale

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.