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Finding the Fourth Proportional to 100,503.88, 138,685.08 and 58,076.08

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Solution

The fourth proportional to 100,503.88, 138,685.08 and 58,076.08 is: 80,139.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,503.88 : 138,685.08 = 58,076.08 : x
  2. Step 2: Convert to fraction form
    100,503.88/138,685.08 = 58,076.08/x
  3. Step 3: Cross multiply
    100,503.88x = 138,685.08 × 58,076.08
  4. Step 4: Simplify right side
    100,503.88x = 8,054,285,800.89
  5. Step 5: Solve for x
    x = 8,054,285,800.89/100,503.88
  6. Step 6: Final answer
    x = 80,139.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.