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Finding the Fourth Proportional to 199,637.20, 299,455.80 and 81,393.40

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Solution

The fourth proportional to 199,637.20, 299,455.80 and 81,393.40 is: 122,090.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,637.20 : 299,455.80 = 81,393.40 : x
  2. Step 2: Convert to fraction form
    199,637.20/299,455.80 = 81,393.40/x
  3. Step 3: Cross multiply
    199,637.20x = 299,455.80 × 81,393.40
  4. Step 4: Simplify right side
    199,637.20x = 24,373,725,711.72
  5. Step 5: Solve for x
    x = 24,373,725,711.72/199,637.20
  6. Step 6: Final answer
    x = 122,090.10

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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.