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Finding the Fourth Proportional to 61,135.60, 91,703.40 and 43,420.90

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Solution

The fourth proportional to 61,135.60, 91,703.40 and 43,420.90 is: 65,131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,135.60 : 91,703.40 = 43,420.90 : x
  2. Step 2: Convert to fraction form
    61,135.60/91,703.40 = 43,420.90/x
  3. Step 3: Cross multiply
    61,135.60x = 91,703.40 × 43,420.90
  4. Step 4: Simplify right side
    61,135.60x = 3,981,844,161.06
  5. Step 5: Solve for x
    x = 3,981,844,161.06/61,135.60
  6. Step 6: Final answer
    x = 65,131.35

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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.