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Finding the Fourth Proportional to 218,633.59, 301,789.85 and 128,018.68

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Solution

The fourth proportional to 218,633.59, 301,789.85 and 128,018.68 is: 176,709.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,633.59 : 301,789.85 = 128,018.68 : x
  2. Step 2: Convert to fraction form
    218,633.59/301,789.85 = 128,018.68/x
  3. Step 3: Cross multiply
    218,633.59x = 301,789.85 × 128,018.68
  4. Step 4: Simplify right side
    218,633.59x = 38,634,738,234.40
  5. Step 5: Solve for x
    x = 38,634,738,234.40/218,633.59
  6. Step 6: Final answer
    x = 176,709.98

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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.