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Finding the Fourth Proportional to 144,911.60, 217,266.15 and 85,716.80

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Solution

The fourth proportional to 144,911.60, 217,266.15 and 85,716.80 is: 128,515.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,911.60 : 217,266.15 = 85,716.80 : x
  2. Step 2: Convert to fraction form
    144,911.60/217,266.15 = 85,716.80/x
  3. Step 3: Cross multiply
    144,911.60x = 217,266.15 × 85,716.80
  4. Step 4: Simplify right side
    144,911.60x = 18,623,359,126.32
  5. Step 5: Solve for x
    x = 18,623,359,126.32/144,911.60
  6. Step 6: Final answer
    x = 128,515.31

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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.