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Finding the Fourth Proportional to 128,020.36, 176,605.68 and 82,737.40

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Solution

The fourth proportional to 128,020.36, 176,605.68 and 82,737.40 is: 114,137.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.36 : 176,605.68 = 82,737.40 : x
  2. Step 2: Convert to fraction form
    128,020.36/176,605.68 = 82,737.40/x
  3. Step 3: Cross multiply
    128,020.36x = 176,605.68 × 82,737.40
  4. Step 4: Simplify right side
    128,020.36x = 14,611,894,788.43
  5. Step 5: Solve for x
    x = 14,611,894,788.43/128,020.36
  6. Step 6: Final answer
    x = 114,137.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.