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Finding the Fourth Proportional to 128,123.12, 191,811.02 and 74,651.88

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Solution

The fourth proportional to 128,123.12, 191,811.02 and 74,651.88 is: 111,760.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,123.12 : 191,811.02 = 74,651.88 : x
  2. Step 2: Convert to fraction form
    128,123.12/191,811.02 = 74,651.88/x
  3. Step 3: Cross multiply
    128,123.12x = 191,811.02 × 74,651.88
  4. Step 4: Simplify right side
    128,123.12x = 14,319,053,247.72
  5. Step 5: Solve for x
    x = 14,319,053,247.72/128,123.12
  6. Step 6: Final answer
    x = 111,760.10

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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.