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Finding the Fourth Proportional to 128,957.80, 192,999.30 and 113,211.40

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Solution

The fourth proportional to 128,957.80, 192,999.30 and 113,211.40 is: 169,433.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,957.80 : 192,999.30 = 113,211.40 : x
  2. Step 2: Convert to fraction form
    128,957.80/192,999.30 = 113,211.40/x
  3. Step 3: Cross multiply
    128,957.80x = 192,999.30 × 113,211.40
  4. Step 4: Simplify right side
    128,957.80x = 21,849,720,952.02
  5. Step 5: Solve for x
    x = 21,849,720,952.02/128,957.80
  6. Step 6: Final answer
    x = 169,433.11

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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.