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Finding the Fourth Proportional to 86,115.90, 129,137.40 and 26,935.68

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Solution

The fourth proportional to 86,115.90, 129,137.40 and 26,935.68 is: 40,392.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,115.90 : 129,137.40 = 26,935.68 : x
  2. Step 2: Convert to fraction form
    86,115.90/129,137.40 = 26,935.68/x
  3. Step 3: Cross multiply
    86,115.90x = 129,137.40 × 26,935.68
  4. Step 4: Simplify right side
    86,115.90x = 3,478,403,682.43
  5. Step 5: Solve for x
    x = 3,478,403,682.43/86,115.90
  6. Step 6: Final answer
    x = 40,392.12

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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.