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Finding the Fourth Proportional to 134,005.80, 201,008.70 and 81,431.40

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Solution

The fourth proportional to 134,005.80, 201,008.70 and 81,431.40 is: 122,147.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    134,005.80 : 201,008.70 = 81,431.40 : x
  2. Step 2: Convert to fraction form
    134,005.80/201,008.70 = 81,431.40/x
  3. Step 3: Cross multiply
    134,005.80x = 201,008.70 × 81,431.40
  4. Step 4: Simplify right side
    134,005.80x = 16,368,419,853.18
  5. Step 5: Solve for x
    x = 16,368,419,853.18/134,005.80
  6. Step 6: Final answer
    x = 122,147.10

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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.