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Finding the Fourth Proportional to 138,881.88, 208,332.63 and 68,742.36

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Solution

The fourth proportional to 138,881.88, 208,332.63 and 68,742.36 is: 103,118.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,881.88 : 208,332.63 = 68,742.36 : x
  2. Step 2: Convert to fraction form
    138,881.88/208,332.63 = 68,742.36/x
  3. Step 3: Cross multiply
    138,881.88x = 208,332.63 × 68,742.36
  4. Step 4: Simplify right side
    138,881.88x = 14,321,276,651.21
  5. Step 5: Solve for x
    x = 14,321,276,651.21/138,881.88
  6. Step 6: Final answer
    x = 103,118.40

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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.