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Finding the Fourth Proportional to 138,718.80, 208,078.20 and 134,126.10

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Solution

The fourth proportional to 138,718.80, 208,078.20 and 134,126.10 is: 201,189.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.80 : 208,078.20 = 134,126.10 : x
  2. Step 2: Convert to fraction form
    138,718.80/208,078.20 = 134,126.10/x
  3. Step 3: Cross multiply
    138,718.80x = 208,078.20 × 134,126.10
  4. Step 4: Simplify right side
    138,718.80x = 27,908,717,461.02
  5. Step 5: Solve for x
    x = 27,908,717,461.02/138,718.80
  6. Step 6: Final answer
    x = 201,189.15

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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.