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Finding the Fourth Proportional to 99,647.88, 137,408.58 and 63,839.40

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Solution

The fourth proportional to 99,647.88, 137,408.58 and 63,839.40 is: 88,030.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,647.88 : 137,408.58 = 63,839.40 : x
  2. Step 2: Convert to fraction form
    99,647.88/137,408.58 = 63,839.40/x
  3. Step 3: Cross multiply
    99,647.88x = 137,408.58 × 63,839.40
  4. Step 4: Simplify right side
    99,647.88x = 8,772,081,302.05
  5. Step 5: Solve for x
    x = 8,772,081,302.05/99,647.88
  6. Step 6: Final answer
    x = 88,030.79

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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.