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Finding the Fourth Proportional to 128,191.95, 192,326.76 and 90,824.31

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Solution

The fourth proportional to 128,191.95, 192,326.76 and 90,824.31 is: 136,263.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,191.95 : 192,326.76 = 90,824.31 : x
  2. Step 2: Convert to fraction form
    128,191.95/192,326.76 = 90,824.31/x
  3. Step 3: Cross multiply
    128,191.95x = 192,326.76 × 90,824.31
  4. Step 4: Simplify right side
    128,191.95x = 17,467,945,271.54
  5. Step 5: Solve for x
    x = 17,467,945,271.54/128,191.95
  6. Step 6: Final answer
    x = 136,263.98

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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.