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Finding the Fourth Proportional to 328,538.65, 492,811.89 and 128,953.03

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Solution

The fourth proportional to 328,538.65, 492,811.89 and 128,953.03 is: 193,431.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,538.65 : 492,811.89 = 128,953.03 : x
  2. Step 2: Convert to fraction form
    328,538.65/492,811.89 = 128,953.03/x
  3. Step 3: Cross multiply
    328,538.65x = 492,811.89 × 128,953.03
  4. Step 4: Simplify right side
    328,538.65x = 63,549,583,326.70
  5. Step 5: Solve for x
    x = 63,549,583,326.70/328,538.65
  6. Step 6: Final answer
    x = 193,431.08

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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.