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Finding the Fourth Proportional to 140,381.88, 210,512.88 and 81,258.36

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Solution

The fourth proportional to 140,381.88, 210,512.88 and 81,258.36 is: 121,852.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,381.88 : 210,512.88 = 81,258.36 : x
  2. Step 2: Convert to fraction form
    140,381.88/210,512.88 = 81,258.36/x
  3. Step 3: Cross multiply
    140,381.88x = 210,512.88 × 81,258.36
  4. Step 4: Simplify right side
    140,381.88x = 17,105,931,387.68
  5. Step 5: Solve for x
    x = 17,105,931,387.68/140,381.88
  6. Step 6: Final answer
    x = 121,852.84

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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.