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Finding the Fourth Proportional to 128,085.70, 192,128.55 and 81,372.10

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Solution

The fourth proportional to 128,085.70, 192,128.55 and 81,372.10 is: 122,058.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,085.70 : 192,128.55 = 81,372.10 : x
  2. Step 2: Convert to fraction form
    128,085.70/192,128.55 = 81,372.10/x
  3. Step 3: Cross multiply
    128,085.70x = 192,128.55 × 81,372.10
  4. Step 4: Simplify right side
    128,085.70x = 15,633,903,583.46
  5. Step 5: Solve for x
    x = 15,633,903,583.46/128,085.70
  6. Step 6: Final answer
    x = 122,058.15

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1.5x scale

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.