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Finding the Fourth Proportional to 328,538.62, 492,619.30 and 128,624.95

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Solution

The fourth proportional to 328,538.62, 492,619.30 and 128,624.95 is: 192,863.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,538.62 : 492,619.30 = 128,624.95 : x
  2. Step 2: Convert to fraction form
    328,538.62/492,619.30 = 128,624.95/x
  3. Step 3: Cross multiply
    328,538.62x = 492,619.30 × 128,624.95
  4. Step 4: Simplify right side
    328,538.62x = 63,363,131,278.42
  5. Step 5: Solve for x
    x = 63,363,131,278.42/328,538.62
  6. Step 6: Final answer
    x = 192,863.57

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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.