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Finding the Fourth Proportional to 128,776.80, 192,776.40 and 113,224.80

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Solution

The fourth proportional to 128,776.80, 192,776.40 and 113,224.80 is: 169,495.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,776.80 : 192,776.40 = 113,224.80 : x
  2. Step 2: Convert to fraction form
    128,776.80/192,776.40 = 113,224.80/x
  3. Step 3: Cross multiply
    128,776.80x = 192,776.40 × 113,224.80
  4. Step 4: Simplify right side
    128,776.80x = 21,827,069,334.72
  5. Step 5: Solve for x
    x = 21,827,069,334.72/128,776.80
  6. Step 6: Final answer
    x = 169,495.35

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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.